Custom controller mapping and inventory wheel for the disabled

I’ve spent 1000s of hours inside Minecraft and have co-run a server for almost 10 years. Last year I got diagnosed with A.L.S. and as of recently I’ve been unable to play MC with mouse and keyboard. The controller settings are horrible, full custom mapping would make a great tool for java and especially a tool wheel would make navigating your inventory so much better (see Animal Crossing as an example).