classic motorcycle forum

I play with this stuff on a regular basis. My favourite ride for many years was an Excelsior with 8C and 2 speed Albion. Exactly the same set up as yours. I've upgraded now to a 175 Sport, still with 2 speed Albion. Sprockets and chain have never been a bother as blank sprockets of all sizes are freely available off the shelf. All it requires is a competent machine shop to do the final machining.
Originally I went to the chain supplier (Renolds) to buy the correct original size chain. They advised who made their sprockets for them and I approached them. Problem solved. No re toothing, no turning off old teeth, no welding just new and perfect sprockets at a cheaper price than that quoted for the re toothing exercise.
Since then I've gone on to source my own sprockets as its cheaper still if you take the blanks in with you when approaching a machine shop. I've also learnt that the clearances twixt sprocket and gear box suit only the original size chain. Modern chain of nominally the same size is slightly wider and heavier and chops lumps off the gearbox.
As an aside I'm Australian. If this is possible in Australia you can be sure it is done in Canada.
The earlier advice to approach Villiers Service about the clutch sprocket and coil is absolutely spot on.
Finally, of course no one in Canada knows anything about your bike. It's the same everywhere with vintage Villiers powered bikes. You aren't alone there. But there are a few of us who actually ride the things and cheerfully swap experiences.
Cheers,