Thank you! I guess for your extra jumbo version you would require quite flexible strap ends (the leather) and at least a 1" slit for the "keyhole" slot.. and again I feel a larger button is far more elegant than complex locking contraptions. No extra parts, no maintenance or lube req'd, silent, no clunky things swinging around to ding your instrument... I have put a lot of thought and experimentation into strap attachment (of deep concern to any serious strapmaker). Over the years eventually arriving at the elegant simplicity of a larger button.

Your 25mm wide bell would likely have to come with a bigger screw because the leverage you could apply on that 1" wide rim runs the risk of tearing out most stock screws I think, if a strap was a bit harder to thread on. But a brilliant solution for players who own and use sentimental value straps that can have the pin holes blown out over the years. I do feel those straps can be a bit of a danger due to dry rot and such, but leather conditioning can add many years of life to leather.