Liqueurs work because they are essentially extracts. IMO people say things like "Jack Daniels BBQ sauce" or "Oatmeal Stout gravy" just for marketing. It never tastes like Stout or Whiskey. You can make a good creme brulee using extracts. For VD I'd actually go with something like Amaretto. If you want to use malt use malt extract or malt. If you want hoppy go get some hops and infuse your cream. Etc.
2/6/15 at 6:06am