@MartinK: I don't know how far are you with the porting to MapboxGL effort. Now, assuming that SFOS3 will come with QtLocation supporting Mapbox GL (5.9, isn't it?), maybe it will make more sense to port it over to QtLocation proper. That would allow you to get simpler installation on desktop (no extra plugins needed).

Although, without newer compiler, they will not be able to provide MapboxGL component in QtLocation and, in general, SFOS3 hopes should be probably as low as possible (aka 'please don't break anything'). But its an angle that you could think about when making priorities and timelines for future development.

In general, with this porting (mapbox gl plugin or qtlocation), make sure that Delete and Backspace and Ctrl-K work on your keyboard. There is a lot of code crafted around getting tiles that waits to be deleted. At least, that's expectation based on Poor Maps days.