Don't know how much more crap you're willing to drag along to these shoots (I'm up to about half a pickup truck load as it is) but something that's worked great for me in less than ideal circumstances is to set up a second background stand, attach a superclamp then attach the hairlight to that. Booms work great for pack heads but unless you shell out the BIG bucks, they aren't stout enough to handle monolights safely.