EDIT: On second look, it looks like this might only bring over the native/bespoke hotkeys rather than the "Alt Codes" which are the majority of (my) shortcuts? e.g. Alt + H - I - S for Insert Sheet. Will have to have a look at it properly
Alt + H opens whatever menu H stands for, then the subsequent letters hit the appropriate menu items. The menus and their hotkeys would have to match the Office counterparts as well, and that's unlikely in normal free software clones. Not sure if it'll be that case here.
edit: After looking at what this tool does, I actually would not be surprised if you could just rewrite all the menus and their hotkeys...
I used Jules agent to help build and refine the repository. I figured others making the same transition might find it useful.
Would love feedback from the community about improvements to the mapping!