This may be the direction i head. I set up an old cheap TLR with an xacto blade and made a test strip pretty easily and conveniently the length is the same as 24 exp 126. This also conveniently provides a backing paper strip. I've found a clear plastic ruler that is exactly 35mm wide to use as a perforating jig. two of them hinged along their length to form template, predrilled holes to align my punch. put a peg in the first hole to keep it from moving...
greg