By the time this is possible (by stem cells bridging two spinal cords), we'll probably be close to being able to transition biologically, thus sort of making this unnecessary. My estimate is 20 to 25 years; maybe sooner if you factor in accelerating progress.
If you think that's optimistic, recall that on this day 100 years ago, medical transition wasn't even a concept in anyone's brain. There are people reading this born before HRT was ever used. I'm in my twenties and I was born before FFS existed.