Works only with snap, unless you want take the trouble of building it on your own...
(I’ve since switched to ArchLinuxARM (and published several videos on how Anbox runs on t he PinePhone on YouTube) and won’t go back unless that breaks, so I don’t know what the current state is on Mobian.)
The keyboard seems like a problem, but a USB keyboard works fine in Mobian; it just needs to find its way through to Anbox.