Trisquel 9 is supposed to support ARM. "could it run on this specific laptop"
I stopped reading when finding that it has a Mali GPU and also RTL8723BS for WiFi. Both of these need proprietary software, which Trisquel wouldn't provide.
"would it be possible to dream of a Trisquel Touch, derived from Ubuntu Touch as Trisquel is derived from Ubuntu? Thus, we could finally have a free tablet (PineTab) and free pocket computer (PinePhone), couldn't we?"
The PinePhone seems to use the same system-on-a-chip and so has the same problems.