[throwawaymath]

I'd push back against the idea of rich interiority personally, but ultimately I think that's more of a philosophical question. Practically speaking since we're engaging in this idea without the requirement to achieve continuity of consciousness, I'd argue it's potentially an unnecessary concern. If you will not continue after death, do you personally care if your replacement has interiority? On the other hand, if you want the things you care about to doing to continue getting done by a replacement, you do care that they are capable of everything you are and respond exactly as you would to every situation.

That being said I think your second challenge is more interesting. Albert Einstein's achievements are the product of both extreme knowledge/specialization, his experience and his personality. I think you'd likely have to have a "knowledge space" which can be mapped to the human "mind matrices." That does complicate things a fair bit, but in the abstract I think a "vanilla human" could plausibly be seeded with Einstein's personality and as much knowledge as you want.