MoonPie flavored MoonPies aren't even good.
I think that I'm with mar52 on this one. I've always found MoonPies to be dry and crumbly and really just not very good, and I live in South Carolina. However, I do have to say that if you can manage to get a really fresh MoonPie from one of MoonPie's general stores in Charleston or Chattanooga, it's a totally different experience. They're a lot better when they're fresh.
MoonPie flavored coffee sounds pretty interesting, though. It would at least be worth a try once. I'll have to see if I can track it down and give it a taste and report back in a day or two.