I voted for Portman as Jane-Thor, if they are going to go that route I would prefer they stick to Portman, and I have no doubt she could get in shape to be Thor if she did do it.
I don't know if it would really even be possible to turn a human into Thor in the MCU. He's pretty much just been Thor in the movies, without any kind of transformations into a human, so it would be a pretty big shift to suddenly introduce the idea of the female Thor changing back and forth from human. I could also see some possible, mistaken, sexist implications with the idea. Even when Thor didn't have the hammer in his first movie, he was still Thor, just not as powerful.
I think Reverend's idea of just giving the hammer to Sif, and still having her be Sif, would be much more likely than suddenly introducing the whole human/Asgardian transformation thing out of nowhere.
I don't know if it would really even be possible to turn a human into Thor in the MCU. He's pretty much just been Thor in the movies, without any kind of transformations into a human, so it would be a pretty big shift to suddenly introduce the idea of the female Thor changing back and forth from human. I could also see some possible, mistaken, sexist implications with the idea. Even when Thor didn't have the hammer in his first movie, he was still Thor, just not as powerful.
I think Reverend's idea of just giving the hammer to Sif, and still having her be Sif, would be much more likely than suddenly introducing the whole human/Asgardian transformation thing out of nowhere.