Depending of A70 magazine configuration it can be perforated or unperforated. Difference is in one wheel and its user interchangeable, as long as you have it.
One could use cut 70mm film(to 61.5mm/120/220) perforated on A70-backs. one must use a one-blade-cutter by xkaes. xkaes at aol dot com. and oneside-perforation must go through the cogwheel. only function: measure even spacing. there is a workaround about using Unperforated 70mm film in A70. see Nokton24-link to rangefinderforum.
simplest is using 70mm film and cut it before developping. but one can easily develop without special reels, but only about 172cm pieces(220-lenght). see also the mentioned very large thread. needed hours to go through but endless amount of hints.