Thanks John, if I were more of a piano player I'd probably agree about the keys, but I like them really light and fast!
Rikki, that's a good idea, and one I've considered. I won't be in a big rush to sell the 4x, but if the opportunity arises...
I very seldom play at home unless it's to learn a song, and I can do that with a guitar.
I will probably use a PSR S970. If my health improves, they are easy to sell, and maybe by then something else will be on the horizon. What I play will have zero impact on my audience or employer, as long as it sounds good, and most everything does now.