Nah I appreciate that. And you're probably right. Only reason I hadn't looked into it was:

a) I didn't know if it could simulate the "Alt Codes" i.e. Alt + 3 separate keys in quick succession.

b) There's 50-100 I'd need to replicate (and arguably all of them as I pick up a new one every short while and it would be nice to be able to universalise them and be able to go back to Excel any time).

c) Even if a and b were no issue, I haven't "mained" Libre Office ever so I'd want to be sure the juice was worth the squeeze and I didn't find that it was missing some key/edge capability (I believe some of the newer functions released for 365 might be proprietary... at least they aren't on Sheets).