postmarketOS, mobian, etc… these are ‘real’ linux distros that work without the android parts. as your device doesn’t have a (near-)mainline kernel port i believe you can boot postmarketOS with the stock downstream kernel, though many peripherals won’t function.

halium based distros like ubports and droidian use a part of the android userspace to make those peripherals work, which can be better if mainline is not possible.