Well I haven't used Plasma Mobile or any of the apps you've mentioned, so it'd be nice to see what it all looks like! (and I don't have a device I can try it on either, unless I can get it working with Termux + Termux-X11?)
Not on this device but I have on a PinePhone before, works just fine.
Ideally it would use the desktop shell on the external monitor though, that sadly doesn't happen yet (but is planned for the future).
thanks. I'm trying to find a cheap 2nd hand device that can run pmOS and has 8 GB RAM and supports USB to DP/HDMI, was hoping this one was on the list.