Steno is 100% the way to go to avoid and heal RSI. Infinitely more ergonomic. It also erases much of the difference between Emacs and VIM (assuming you use repeat and 1up). Yes, it has to be learned. But you already learned Emacs or VIM, so clearly you're not afraid to invest a little now for a big return later (e.g. no RSI). It's also fun.