A few years ago I purchased a few shrink-wrapped Office on ebay for each of the versions Wine claimed to support best, tested then with wine32 and wine64, and concluded the "sweet spot" was Office 2010 in wine32 (it may have changed, as wine keep evolving)
Yes, it's 15 years old software, but it works flawlessly with Unicode xkb symbols! Since it doesn't have any network access, and each app is isolated in a different user id, I don't think it can cause any problem.
And Ii I can still use vim to do everything I need and take advantage of how it will not surprise me with any unwanted changes, I don't see why I couldn't use say an old version of Excel in the same way!