Follow-up comment, since one of the comments mentioned Nvidia Shield: I just realized LineageOS can be installed on various Nvidia Jetson devices: https://wiki.

Follow-up comment, since one of the comments mentioned Nvidia Shield: I just realized LineageOS can be installed on various Nvidia Jetson devices: https://wiki.lineageos.org/devices/#nvidia https://wiki.lineageos.org/devices/#nvidia (In fact, there are also inofficial LOS builds for Raspberry Pi, too: https://konstakang.com/devices/rpi4/ https://konstakang.com/devices/rpi4/ ) This seems to match my requirement of "hackable" quite well, though Nvidia Jetsons are obviously not "fully open" or anything and a quick search yields various threads of people struggling a bit to get LineageOS runnning. But it does seem possible! (Not sure whether Netflix or Prime would run, though.)