a cowbell sound can work nicely. for what its worth, im a drummer and the only way to really play with a click is for the drummer to practice with it, period. this can vary in time depending on the drummer. i think an average drummer is gonna need to bust his ass practicing with a click for at least a few months before they will be natural with it. im sure some people might be able to do it naturally or master it faster. but most drummers have to break themselves down and relearn proper timing both in general and their own material. this scares the hell out of drummers because its alot of work. but its the only way to do it.