Looks like it could be the answer. I'd like to see a video comparing the time it takes to change a rim brake rear wheel and one with RAT. I can't seem to find one on YouTube.
I reckon the smarter move would be to have the cassette and the brake outboard of the frame. Not sure how you would do it, but some smart cookie could come up with something clever.
I think I posted ages ago a prototype that appeared in the 80s and was shown at some bike shows. The cassette stayed in the frame when removing the rear wheel. Clever. ****ed if I know how it worked. I think it was in an old Winning magazine. I may still have it. I had probably 100 of them but piffed them all other than the first few editions.