I wouldn't say finance is particularly hard compared to economics. In my books if you can do economics, you can more or less do finance. There is the Black-Scholes model and real options that you need to learn about, but you're more or less parroting and paraphrasing the models as opposed to deriving or doing complicated calculations. Any calculations you do tend to involve plugging in numbers.
Yeah, the level of complexity in accounting is incredibly low. However, they do expect you to have the same opinion as the lecturer and being able to identify issues in financial accounting. Double entry is difficult to get your head around if you're used to mathematical calculations, but once you get it and see the big picture, it's pretty straight forward.
Consulting generally doesn't really involve finance, unless you're opting to be a specialist. Consulting for most parts is about selling and being able to communicate really well. The amount of economics you will be using is next to none, which is why pretty much anyone can get into the field with a degree. It's something similar with HR - less about theory, and more about people skills. In terms of marketing, it depends on which aspect of marketing. Marketing research/analysis will probably involve a lot of stats, whereas jobs like copywriting and advertising involve more people and creative skills than anything you pick up in economics.
Employers tend to value people with experience over qualifications i.e. theory. So, I think you will find the workplace easy to settle into. However, as you can understand, economics is mostly theoretical, so I don't know how you will feel after your second year on the degree.
I have recently come to understand the difference of economics with/and management degrees and economics management degrees. The former involves an even split of economics and management modules, whereas the latter is either a management degree with a focus on economics topics or an economics degree focusing on management topics (i.e. it's essentially a management or economics degree disguised as both economics and management). In the sense, they're not the same thing. I had classmates who were doing a Master's in International Business (Econ), but they ended up finding out that it was essentially an economics degree based in a business setting.
You might want to check the course content to be sure you know what you're applying for.
Any practical course you can get your hands on will probably give you more insight than what course providers/directors can sell you. However, you might want to understand that it's not the same thing as in the workplace. In the workplace, what you learn from books and courses don't apply as well - you may know the theory, but you will get people in your department who will disagree, or you may end up using 5% of what you actually learn i.e. cog in the wheel and repetitive work.
If you decide to go into the careers you have mentioned above, you might want to consider the following professional qualifications after uni (check with the employer before applying, since most should not be necessary):
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General Business Consulting - CIMA (it's an accounting qualification, but I'd say the information in this qualification will bring about the most benefit to any said company). It's not necessary to have a qualification to consult, but it helps.
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General Marketing - CIM (I'm a little biased here, but I see CIM being more attractive and recognised than most other marketing bodies out there e.g. IDM, IPA)
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Marketing Analysis/Research - MRS
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Digital Marketing - there are no real central professional bodies out there, especially for things like SEO. Each major company has their own qualification, and no one has the right answer. I do recommend you getting the Google qualifications for this though, since they're free. Facebook Blueprint is available, but you have to take the exams in the US, which is a bit far to go for one degree. CIM do offer qualifications specialising in digital marketing.
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HR - CIPD (the most widely quoted qualification out there for HR)
Some of the degrees you come across may have association with the above professional bodies or allow you to have exemptions for some of their levels or modules. You might want to check with the degree and the professional body first.
Beware that certain advisory roles can contain certain risks to the professional i.e. you can be sued. It depends on the particular role and industry concerned, but generally if you legally need to be part of a professional body to do the job, it's highly regulated and you can be sued for giving the wrong or bad advice e.g. doctors, solicitors, financial advisors, accountants all work in highly regulated industries where they give advice. You can see the sense of it because the aftermath of the 2008 financial crisis came about partly because the people selling mortgages weren't regulated and gave advice to people who shouldn't receive certain advice.
I don't think there are heavy regulations in any of your chosen professions, and I don't think consulting generally is liable to such professional standards, but I'd check beforehand. It's particularly telling if the first module you do with the professional body is in regards to ethics, professionalism, and standards. Chances are, it's a highly regulated area of work.
I'd also strongly recommend you get your skills in Microsoft Office up to date before going into the workplace, considering how much your chosen careers will be using Office on a regular basis. With consulting in particular, you can end up doing a lot of Excel VBA stuff just to handle a lot of the data. I'd recommend looking into the Microsoft Office Specialist qualification, and you'd ideally the get MOS Master but Excel Expert should be good for most jobs.
I'm not familiar with the term 4SW and 3SW. A quick google search showed the following:
https://www.thestudentroom.co.uk/showthread.php?t=6174690. From this, all I can gather is that one is either an integrated master's or an integrated foundation degree, and the other is a standard bachelor's. I'd check with the individual university and department.