Also gonna mention Postmaster, which supports lots of ARM-Linux handhelds

There’s support for it on the RP5 via Rocknix, which is the successor to the device OP mentioned :)

Modding an unpatched V1 Switch is pretty easy, the most difficult part is there’s like 2 main guides and if you try to get support from one group and they get clue that you’ve looked at/used the other guide they’ll say your config is trash and a ban risk lol