A drink doesn't have to be "fancy" to be popular. Infusing vodka/tequila/rum with a hot pepper is not common, and would get some attention, especially from those who are competitive. People who visit high-end restaurants typically have money to spend, and got that money by being competitive. So yes, infuse some bottles with varying levels of peppers can appeal to that competitive spirit. Give a few away to start the ball rolling.... at the bar, have two bartenders challenge each other and put on a show. Follow it with a bartender (yes, frankly, a chick is best) challenge a patron with a spiced Patron.
Want some foo? A restaurant in my area mixes hot pepper powder and sugar, and simply dips the wet rim of the glass in it. Use brown sugar for a bolder look. They do this with margaritas, tequila shots, and whatever, on request.