Or cobble together a Greek Orthodox priest outfit and go as Q (undercover) in For Your Eyes Only.
I think this sounds like a cool option. What about a facial scar? Wear an eyepatch, and have a deep scar go vertically through the patch. Do make the hair dark, I think most of the villains(although not all) that had hair had dark hair. A gold ring for your pinky finger.
Sorry for yet another post, but…
If you happen to have a mutual male friend who’s also going (especially if he’s single), you could play Mr. Kidd to his Mr. Wynt (the gay assassins from Diamonds Are Forever). It helps if he bears some resemblance to Bruce Glover, of course. Your wife could then get a big red curly wig and be Tiffany Case.
Accessories: a hollowed-out book or small box, a small cloth bag of clear plastic faceted jewelry beads or somesuch, a fake scorpion, and very strong aftershave.