My search for William Jean's straps and bracelets has hopefully been solved. He is no longer on eBay although a small site called nato9boutique, also from north Toronto, looks quite similar in layout. However, here is my discovery tonight: strapboutique.com All the good WJean stuff as before and probably US based.
I'm probably out of the loop, as they say, and all this may well be common knowledge. However, if this is of help to fellow watch addicts, my detective work has been time well spent. And for me to spend time well, that's most certainly an improvement.