I would like to have the keys M, J, K, L, U, I, O to be mapped to 0, 1, 2, 3, 4, 5, 6 (combine with the keys 7, 8, 9 already being on top of those keys) to be a total numpad when I hold a modifier key, say Alt/Meta.
In that way commands with numbers like 25j, d3w, etc. would be easier and faster to be typed. But I haven't figured out how to make this happen.
As it is said in this answer https://vi.stackexchange.com/a/2363/21584, I've tried this solution:
execute "set <M-j>=\ej" nnoremap <M-j> 1
But it only works with commands which begin with a single number (7j), however complex commands which have number inside or multiple number (d3w, 25j) don't work.
I use Ubuntu 18.04, on terminal Kitty.