If a bunch of guys want to put their stream fishing skills against one another for a cash prize then why not have a casting contest combined with a canoe/kayak obstacle course that includes shuttles, portages, and surprise paintball dodging from "landowners" ?
Anyone can catch a nice bass, just roll the dice or flip a coin and call your winner. No need to kill or relocate a bunch of river Smallmouth. Bad idea, I hate it.