We are a bit ahead of the curve in that regard at least, as it is built in Qt, which is very much at home on Linux, especially for those using KDE. You might as well consider it “native”. Now as for some of the more unusual libraries, that is where there are speed bumps, such as Paddle activation, MHT page archival, and perhaps a few other things as well. Nothing that would be impossible, but some of it would be difficult.
The main issue has, for years now, been less with how much work it would take, and more about how much work Scrivener still needs done to it.