Where should I go to get a 1 year business visa for China if I'm Canadian but a non-resident?

I was teaching in Taiwan and moved to China w/ girlfriend for work. Was only able to get a one-month single- entry tourist L and then had it extended for one more month. I'm currently in HK for a renewal but seems to be difficult to get any type as I've been told, "Not sure if it will be accepted" so it's still pending. As my post-secondary education is a college diploma and not a degree, I'm unable to be issued a Work Z for work but some schools are apparently registered to fire foreign employees with a business type. With an invitation letter from the school (employer), is it possible to get it in HK (although I was told they can only issue 30 business type but I also didn't provide an invitation letter)? Or do I need to fly to Vancouver (closest Canadian city)? Also, again, I'm a non-resident so will this be a problem? It would be ridiculously expensive to fly back to Canada but receive nothing. Any help/suggestions would be greatly appreciated.