If you get a gen bezel you know it's not going to fit the UPO don't you? You can use the insert but the bezel itself cant be installed.
As for other mods well, it depends on how much you want to spend really. You can get gen dials, crowns, crystal etc etc if you want to make a hommage piece. Swapping or splicing the dial might br a good one to do cause the Josh rep has the incorrect 'feet' on the omega logo. Silix's model has the correct logo but there are other issues with her dial. You could get the dial from her and transplant it onto yours if you like.