You could always just rehearse enough that it doesn't matter if you lose your monitors. One band I was in that did all that bitchy interwoven prog stuff, had the monitor mix go out on us in the middle of a set. We just kept going, playing it the way we rehearsed it, and it came out sounding fine. My GF and sister who were out in the audience (and knew our stuff inside out) said nobody noticed because we sounded like we always did.
Like the saying goes: You don't rise to the occasion. You default to your level of training.
Ya I always push for more rehearsal time but no one seems interested.