Chastity and orgasm denial discussion

Mistress enjoys how much I squirm and jump about following a session using a green elastrator band on her balls when its cut off… The pain is short but very intense, actually up until that time it can be almost pleasurable (too a point!!) having your balls strangled. So far however whether I have been allowed to cum, spanked or arse reamed, when its time to cut it off I end up having to do it myself usually with side cutters (with the piece of string so you can pull the band back to get under it and cut). Mistress has expressed a strong desire to ruin my orgasm by cutting band off at the point of orgasm…however we cant work out a safe way of doing this… As I said we use some wire side cutters to get it off currently but wondering if anyone has some ideas on what we could say leave under the band while I am stroking to an edge that mistress could safely cut the band at the right moment remembering I do jump around a fair bit when it comes off because it friggin hurts. The bands are pretty tough and strong it requires something very sharp or snippers…maybe curved snippers …don’t know that’s why i am asking!!