For the OS stuff wouldn't a European distribution of Linux do. Worst case if Europe could no longer get access to patches it could fork it. OK Europe might get behind, but that doesn't seem like an immediate issue, in the same way that not having AWS would be?

On programming languages it is a concern how popular .net and Java are in Europe. However being stuck on the current state of Python is less of a worry. I feel like I was always 10 years behind on needing new features.

Edit: I concede my .net concerns do pull through to Linux. If you were selling Linux solutions to Government or big business, I fear Redhat might be chosen before Suse and Ubuntu