> but can you diagnose a patient? To learn that, you need access to training in real hospitals which are only given to students enrolled offline.

There are medical simulation tools that teach you to diagnose patients, train you in surgery , etc.They seem to be very effective as a training tool. One can imagine a certification process that tests you using this tool, and verifies that you have good diagnosis and prescription skills , and maybe part of the treatment skills.

That might be a good enough basis to admit you on a trial basis as a resident, or to a pre-residency short program.

Maybe in a similar fashion, one could build a simulation software that can train biochemists affordably ,and test to see you're qualified enough to work in a lab.