If conviction/emotion/release=bleeding, then I think you're taking the guitar rock hero thing a little too seriously. I've bled a bit in my day on stage, but I don't see the point in pushing a performance to such an extreme that it renders you useless for the next gig. Unless your gigs are so few and far between that it doesn't matter (that's not a dig), where maybe balls-out is more justifiable. I'm just talking, you know... common sense, I guess.
I'm not saying you should cry, I'm saying a little electrical tape can do wonders. The only people that should bleed that much in front of an audience are performance artists, because they crave the attention that much.
Cards like these are/were available all over the country, with a general "Please help me, I am Deaf" message on one side, and a handy-dandy chart of the sign alphabet on the back. I don't think it's NY-specific.