Honestly even most Excel users would be fine transitioning to LibreOffice Calc. I was very impressed with how most of my spreadsheets just worked on recent Calc versions. Formulas and charts were mostly all fine. Even pivot tables worked. I had one formula that had to be changed (it was specific to Excel, but there was an equivalent option in Calc), and one external data pull that I had to figure out. That was across 4 pretty involved spreadsheets.
The main problem will be users who are so ingrained with the specifics of navigation that they can't easily adapt to a new menu system. The same happened when Microsoft changed from the old toolbars to the ribbon. And that will be an issue across all the apps.
From an article about the painting, it seems that the alabaster jar and faint halo over her head are references to Mary Magdelene? If the 19th century repaint was to make it a pretty picture for sellability then I could see why they wouldn't want such a heavy subject matter.