Good luck with that. I can't think of any legitimate programs that don't require at least the general GRE (except probably internal MS as part of a BS/MS program).
Overall the general GRE is just another hoop to jump through, it's not particularly hard unless you want an insanely high score (inquire if they have minimum cutoffs). If it's too much effort then I say skip it, a formal degree is not the only way to get research experience. Though since you are trying to resume pad, I guess it'll ultimately come down to how badly you want it.