I don't have a lot of experience flying, but I followed the advice given me and had no problems getting film hand inspected. That advice was, get there early and be polite and sympathetic and apologetic to the TSA staff you encounter.
That said, the foil wrap will likely throw them off. If there's any way you can find something that looks more like what film would wrapped in you're better off. I carry everything out of boxes (though still in the regular inner wraps) in ziplock bags to make it as easy on them as possible. Because of the foil wrap, maybe if you happen to have with you anything that supports what you do (like a mini photo album). OR, maybe make a little how-to video and post it to YouTube about how to hand roll 127 film, that you can pull up to explain to them.