Does a monopod count as a stand? If allowed, problem solved. If not - handheld? Or a hat mount using one of those baseball hard-hats with the beer holders on either side?

Have you spoken with the venue manager or representative directly? Tried multiple people?
The Odeon here in CLE has a policy of dumping tapers in the deep back corner, but I finally talked 'em into letting me clamp to the front of the raised soundboard structure by finding the right guy to talk to (not the manager, btw).