Is there a way to achieve full disk encryption (LUKS/cryptsetup) with the 4 SE?
As there is no installer but only images to burn i’m not sure that it will be possible?
I which case i would resize/add a partition and then encrypt only that one, unless there are better alternatives?
Full image disk encryption
I don’t think it’s can be done easily, look into how it done on RasPi and try to recreate it. Since Rock 4 in mainline kernel - try to use armbian for that purpose
i’m a bit hesitant if armbian is ready for use in production of actual devices?
It’s depends, since kernel is the same there shouldn’t be that much difference between them in regards of stability.
You may also use ubuntu from radxa, it’s anyway for testing for now