I don't do edgebanding myself, (l use it so little, I only have used the iron-on kind) but found this thread interesting and did a google search with German searchterms and I found a similar thread on a German woodworkingforum.
link
If I translated it correctly, I think the method that worked for him is putting the puck in a benchvise and cutting it with a scraperblade on an oscilating multitool.