Maybe I'm missing the point you're trying to make but people who get hysterectomies aren't doing it for fun, they're doing it because the organ is diseased so giving it to someone else wouldn't work.

Among those "trans people who are assigned female at birth" who "get hysterectomies" how many would you say are doing it because the organ is diseased. (Not that the proposal is practical, of course.)

This is not true; trans men get hysterectomies for different reasons than that it is diseased.