@zzarr
Yes, some apps work on UT within Libertine (The Gimp, LibreOffice, ...) but they UX is not made for mobile and touchscreen, so it's not a good experience IMHO.
It's also often slow and not without bugs.
So yes it is possible, but not something one would be using on a daily basis, think of it as a failsafe is case of need.
Dual booting is not possible because no BSL exist as far as I know. And GSI devices are work in progress so we don't really know until we can see something real. Kind of the same thing about the outcome one can expect in porting...