Don't mean to trivialise this problem, but, libreoffice provides full keyboard shortcut customization, which I find very easy and intuitive to work with, including, if you really wanted to, a "bring up menu then functionality from that menu" multi-key sequence shortcut as you describe here. So isn't this something that could be solved relatively easily by reassigning keyboard shortcuts once in your machine?
pcchristie|11 days ago
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).
tpoacher|10 days ago
Having said that, I'm not a heavy Excel user, yet I'm already aware of some differences between it and Calc which are probably not a simple matter of reassigning a keyboard shortcut. Switching from AB mode to RC mode is one example; in Calc you need to go to Tools::Options::Calc::Formula::Syntax to switch. But so far I've had no problems working in Calc in general. I was able to follow Joel Spolsky's infamous "You suck at Excel" video [0] with no problems, for example.
[0] https://www.youtube.com/watch?v=JxBg4sMusIg