46 years working with glass and all the rest of the construction stuff..
Tempered glass is not a problem, however,
The local glass shop cannot do it because the tempering of glass is a special process and requires special equipment. Think of it as a large oven - tempering is heat treating the glass.
The glass shop has to send the glass out to get tempered, then get it back and install it. They likely can't be bothered because it is a small job and a bit time consuming. Tempered glass cannot be cut. It has to be cut to size, then tempered.
And you don't need a template, you just need the size, and it has to be exact. You need the thickness of it too. Keep a broken piece so it can be measured. 3 mil, maybe 4?
Where in Canada are you? If you are anywhere near Calgary I will fix it for you. Easy to do.
Or, if you can get the exact specs, and the tint, I can get it made here and send it to you. Might be a bit of a challenge to match the tint exactly.
Here is another option. I can get lots of 4 or 4.5 mil tinted acrylic. That stuff is easy to cut. I have the tools for that. I had a break in once to a TT and replaced the broken window with acrylic. Nobody, including myself could tell the difference by looking at it.
Taking out the whole window and sending it away? Forget that!! Fix it where it sits.