re: Liability of teaching a class in my shop - Canada

I don’t know about Canada but I think the solution below might work up there.
Jim, my woodworking teacher, worked around the insurance policy and shop rent.

What he did is to give the class at a local senior center that had a tiny shop. They had insurance and rent is covered.
When he outgrew the center he signed up to give a woodworking class at the adult school that have a much bigger shop. He could accommodate up to 20 students. He also brought some extra tools on his own so he could offer more.
He did not have to worry about liability or rent. He got paid and also made some reasonable money on supplies.

Teaching is very rewarding and I am sure you do very well; I know that first hand:)