If the guitar part is killer... and everyone hates the lyrics... change the lyrics. That's what I would do. You can still keep the song for yourself in the original form... But don't tie a good guitar part to something that people aren't into. Just rework different words over the guitar part until you find a band that wants to play it the way you want to....

Sometimes I write 3 or 4 different songs over 1 guitar part... Sometimes I write 3 or 4 guitar arrangements for 1 set of lyrics... Don't limit yourself.