Right, in which case have you spoken to the college regarding your results from Maldova and what they are the international equivalent of under the UK system? If they haven't, then ask them to refer to ECCTIS (see:
https://www.ecctis.com/_). This would help eliminate the need for so many GCSEs, unless you specifically want to do them for some reason.
In terms of your Plan B, ECCTIS would also apply for university applications. I would only approach the Level 3 course if it's necessary.
In terms of Plan A, I am surprised that they would need you to have X number of GCSEs without considering your previous qualifications. I understand that English and Maths might be a requirement, but for carpentry, it's not strictly a requirement as such at most colleges.
Degrees in construction management tend to ask for any Level 3 qualifications as far as I know, so long you have high enough grades. Have you looked into the specific degrees that you want to do? Entry requirements between degrees can also vary. I've included a sample of 5 courses for your reference:
https://www.gre.ac.uk/undergraduate-courses/engsci/construction-management-bsc-hons#entry-requirementshttps://www.londonmet.ac.uk/courses/undergraduate/construction-management---bsc-hons/#entry-requirements-sectionhttps://www.reading.ac.uk/ready-to-study/study/subject-area/surveying-and-construction-ug/bsc-construction-managementhttps://uel.ac.uk/undergraduate/courses/bsc-hons-construction-managementhttps://www.bcu.ac.uk/courses/construction-management-bsc-hons-2023-24#entry_requirementsThe common qualifications these universities ask for are A Levels, T Levels, BTECs (extended diploma where possible), IB, and Access to HE all in any subject.
There is usually a page specifically for international equivalent qualifications from specific countries, but I have only found the equivalent for Maldova from one university listed:
https://www.gre.ac.uk/international/countries/moldova-republic-ofFor the others, you would need to contact undergrad admissions to ask for the information.
I would also check whether the carpentry courses that you're doing at Level 3 is accepted at the university that you want to do your degree at. If they don't accept it, you would be wasting your time and money, unless you are able to obtain employment from the qualification (it's not a legal requirement for carpentry in the UK though).
Should you wish to study A Levels or IB at college, you would need to apply as soon as you can to get in. I would ask the 6th form admissions and affirm whether you still have an opportunity for a place (I wasn't sure whether you are strictly over 17 by now).
If not, you are likely looking at doing Access to HE or BTEC in order to be eligible for the degrees at university (although some do accept qualified experience from professional bodies).