bottom line: people use grief/beast zerkers on their bvcs because it's been tried, tested, and proven thousands, or even millions of times over to be the best vanilla setup for bvcs.
if you wanna do something funky or creative with your bvc, don't expect it to function at the same level as a grief/beast one. if there was a funky/creative setup that allowed the same effectiveness, trust me, someone else would have already thought of it, and it would already be widespread. after all, this is a 10 year old game with thousands of players.
long story short, your bvc will either be creative and not as effective, or cookie cutter, and just as effective.