Tim have you looked at removable shells. This is a feature of some manufacturers in the US?
I would think there would be interest for Glock 17/19, M&P FS, and SIG 320 series to name three. Without CCW in Canada I would think demand will be limited. I have a similar product for my M&PFS and frankly seldom use it. The US market is saturated with similar designs.
Take Care
Bob