Yes I have! My wife lived in Can Tho when she was a child, and we like to vacation in Vietnam when we can. My mother-in-law and father-in-law recently moved in with us and it has been fun trying to mix some of the Vietnamese flavors with more traditional BBQ recipes. Fish sauce has been a good salt substitute in marinades, and we've tried adding some of the different Vietnamese herbs like rau ram, ngo gai, and diep ca to recipes. Sometimes it works; sometimes not so much! I love bo la lot, but I tried to smoke it once, and it didn't come out very well as the smoke kind of overpowered the flavor and it got too dry. If you ever have any suggestions for any fusion BBQ recipes, send them my way!
I love my BBQ, but I still think Vietnamese food is as good as it gets!