I think this “restriction” is illusory in this particular context because ultimately you have to decide on the degree and I don’t believe they’re similar enough to be interchangeable. Also, I don’t believe it’s true you can do a biomedical or biochemistry degree and then go on to do a chemistry masters or PhD, at least not easily. Biochemistry for instance, contains very little chemistry despite the name, it’s essentially a degree in cell biology. We had a girl join our organic chemistry PhD research group who had done a biochemistry degree (top of her year) and she didn’t even know the basics of organic chemistry that the rest of us chemistry graduates had covered in our first year. She had to learn it from scratch and even then she wasn’t very confident in it because you can’t really learn 4 years of degree level content easily. Similarly, I don’t believe biomedicine or biochemistry give you a strong enough understanding of drug molecules, their chemistry and how you synthesise them to become a drug discovery synthetic scientist. I think your issue is you have to become a little clearer about what you want because medicine, biomedicine and biochemistry are not necessarily similar enough to give you all the same skills and open up the same doors. Moreover, graduate entry medicine is enormously more competitive than undergrad entry so that’s something to bear in mind.