Why is all this necessary ?
How about the BMs just do their jobs, check the posts like they're supposed to and ban the spammers from their campaign ? They're pretty easy to spot.
I don't know how much they're paid but I'm sure it's enough for them to do that simple effort.
You see a guy posting useless stuff in megathreads, you remove him, you see someone saying "great project" or anything similar, you remove him etc...
Why create a rule that will lead to more cheating obviously ?