Well, in Nyton's case, the issue would probably be trivial. He went from a clean 'never died before' record to 'twice'. He's no longer the original as far as flesh and blood goes, though he benefits to a certain more direct continuity thanks to his memory chip... something a Yamataian body would likely be able to accommodate.
So...
1. It's either an issue of the player not wanting to.
2. Or the player being okay with it, trying it out, delivering new instructions for his next demise and then dying again and those instructions being followed.
3. Or the player being okay with it, trying it out and later transferring back to a non-yamataian body with the memory chip transplanted.
4. Or the player being okay with it and Nyton deciding that he actually likes the Yamataian body better than he thought and decides to stick with it.
...as far as Nyton's track record goes, and based on continuity, I'd expect something like #3 to happen, without him going batshit insane in the process. #1 remains totally feasible, simply because Miharu could just choose not to drop an identity/existencial bomb on Nyton at a point he's feeling pretty preoccupied and brittle.
Personally, I'm fine with Nyton either way. I don't have any keen need to make him a Yamataian. His identity and character draws richly from his nepleslian background and I think that's something Blas cares about keeping.
But, I pointed out the be-yamataian-on-second-death because it's true. Blas can tell us what he wants once he stumbles across this.
