I happened to have an unfixable agfa folder laying around. My problem was the spacers would cause binding on the last two frames. So using one of the agfa flip up holders fixed that perfectly. I actually cut the whole end off the agfa and epoxied it in there. No more binding. The other end, the take up spool, works fine with the spacers.
By the way, I'm using a Kodak autographic 3A for a 6x14cm frame. Your film counting hint works well too. And this camera has the "autographic" slot. I covered that with rubylith and use it as the frame counter. No need to make a new hole.