Ian Grant
Subscriber
Start shooting 8x10", where every sheet is the same as the area of a 36 exp. roll, and you'll stop worrying about the unexposed frames on your rollfilm cameras.
Don't exaggerate David, there's a far simpler answer. I'm known for dropping coins and them landing on the back of my neck as I look for them

The OP should switch to Exakta's Varex/VX series, the built in blade allows the frames used to be cut off and processed separately.
I was just as tight when shooting half frame, it's the Scots blood.
Ian