Yeah, I'm very familiar with the federal issue (to say the least, read ahead), and how every province has decided to interpret the laws however they want. There are a few ways to get it done, either with approval of the lieutenant governor, as you stated, but also by a body designated by the legislature. For some reason, here in BC, they had allowed amateur specifically, but not pro kickboxing or Muay Thai. Pro (and amateur) MMA was sanctioned for years.
A bunch of people had been hounding the BC commission for years to try to change this here. I finally got tired of it, and actually wrote a bunch of stuff down. It turned into a rather popular petition. And, in large part thanks to that (or so my sources tell me), pro kickboxing is allegedly legal here now. No one has done a show yet, because it was supposed to start in early 2020.
Feel free to use any of this if you so desire (it's public domain, after all). It took a while, but it eventually worked:
https://www.change.org/p/bc-athletic-commission-allow-professional-kickboxing-and-muay-thai-in-british-columbia