I'm thinking the embossed letters should say SOVEREIGN. That should give them a good idea in advance of who they are dealing with. 
Please tell me you're kidding. The would have to know the word, then understand the concept. You'd have an easier time getting them to understand NTASLV, plus we're working with a 7 letter limit here.
Actually, there is not a letter limit. But obviously the more letters there are, the smaller they will have to be. I made a point of clarifying this issue with the company and they made it clear to me they could do virtually anything we present to them.