Reviving this thread but I have found an answer. Yes, it can be done!!! As of recently, Max Braun on Twitter has successfully put a Raspberry Pi Zero W and a Raspberry Pi Camera Module into an iSight Camera. You can read his article about it [https://onezero.medium.com/todays-webcams-are-boring-so-i-brought-back-a-classic-291cc7c94c76|here] and his Github Repo can be found [https://github.com/maxbbraun/pisight|here].
I am planning to do it for my iSight Camera soon! Just waiting for the parts!