> I think the only real way to run Office is on Windows in VirtualBox

I think you’re right, but I just don’t want to run full Windows because it’s such a resource hog. It’s always chewing CPU for some background task or other, and so it drains the battery noticeably quicker.

I have the Mac version of Office, which is fine for most things, and LibreOffice fills the gap for a small handful of non-Excel tasks, but I do love Windows Excel for more complex spreadsheet tasks.