@trainailleur Good points. Once I figured out how to create an ubuntu-touch image that at least boots I will definitely look at what's there for the PinePhone.
Maybe even for the route towards a bootable image efforts could be shared with pinephoneporting. Which tooling to use to even create an image, etc. @UniSuperBox is there any public repo for how you guys are kicking around the pinephone?
Another relevant resource is probably the way how librem builds and installs their image, since they have to have a way of getting some kind of linux system without android onto the librem 5. Maybe just building that image yourself will already teach you a lot.