i think protman has been working on Impulse Tracker keybindings, check out this thread: https://forum.renoise.com/t/impulse-tracker-style-binding-suggestions/30806
other than that one i’d give you probably the same suggestions you got from Joel Johansson. i do think using these IT keybindings will help you though, seeing how keyboard-oriented most oldschool-trackers are, i can imagine this to be quite a hurdle. i have no idea how far these IT keybindings are, but you could consider sending a PM to the creator for further inquiry.
good luck!