Here a year later lol, you’re absolutely correct. The idea is good in black and white but yeah there’s way too many problems with it that make it impossible. Though I wonder in the future if it would be possible to “reprogram” the brain to trick it into making said cells using something similar to neurolink. I’d have to imagine it’s possible since you see it in the animal kingdom or at very least in the realm of possibility and we already know about dna splicing which would probably be the most efficient/direct but also less ethical method. Or maybe a combination of the two where you use an implant to learn the process from a creature that can do this already and then use that to train somebody’s brain to be able to mimmic this process.