I agree with what Gale and Rich said Go for it
definitly if you like what he is doing it could be a great opportunity and lead to others as well........
I was never a big country fan myself but I do like southern rock ( Skynyrd, Outlaws, Hatchet, Poco, Eagles, Allmans etc.) which is not too far from what's been going on in country for many years now.
also the past few years now I've been watching CMT on cable and have liked alot of things I've heard ( Diamond Rio, Rascal Flatts, Emerson Drive etc.)
as for your Epic 5 strings they should fit in to any style of music you want to play, I caught The Grand Ole Opry a while back, I forget what artist it was, but the bassist was playing a Zon Legacy Elite 6 string bass, he had an excellent sound, ( sometime in the future I'm tempted to have one made after hearing how good it sounded and looked)
bottom line, if its a good gig, and your into it, no matter what kind of music it is, don't pass it up......I wouldn't
I have people call me up and ask me to play or fill in often, I only turn them down if I am unable to fit them in my schedule.
good luck and best wishes,
Bruce