S. , First you would have to find a jeweler that would make you a custom ring with the motto on the outside. Not impossible... So yes you could probably have someone make you a custom ring with the motto on the outside, cast, made from parts or engraved on outer band... I have seen rings with the motto engraved on the inner band which shouldn't have been a problem.

In the 20s, Hitler and the Nazis would do anything to have their ideology, emblems ,propaganda put out there. You could get swastika / organizational rings, cufflinks, tie clips, watch fobs even womens make up mirrors with AHs image or swastikas on them and many more products...
As soon as they secured power in 1933 the laws came out , patriotic items became 'kitch' [cheap junk] and it all slowly stopped. They even tried to stop skull rings!. But they and a few others survived..

As far as Hitler,,,,ever see the 1000s of sheets of unused AH stamps?. Well he got a royalty [$] for every single one printed,,not sheet, each stamp! The swastika, runes, various mottos even though developed by private citizens had become sole ownership of the party..
Years ago in interviews done by mail I asked about motto rings AH head rings etc. The 3 responses I got was 'it just wasn't worth it', one said that even IF you could get thru all the paperwork, pay the royalty for a batch of rings the party thought they owned you. Inspections, their rules for advertisement, suggest retail price, list of whos buying etc... - No profit in it.. and our pieces being private purchase thats the magic word guys,,profit.. No profit the ring wouldn't be made... Sorry for the history rant guys,,,enjoy your weekend!!