A (possibly stupid) thought I just had

I don't know if this has been posted before but, I'm rewatching ATWOW rn and thought, what if Grace's Avatar is kept alive, bc Kiri will die in one of the next movies and since Grace and Kiri (im going w the "Eywa is the daddy theory" here) share the same DNA like Jake and Tommy, Kiri would be able to transfer into Grace's Avatar, right?