Are rubber couplings allowed for drain stack in Ontario?
To learn whether a no-hub coupler is allowed, call your local inspection office. A quick description of the project should make the application fairly clear and you'll have your answer.
It may be a moot question, though. I'd be doing something like this:

Cut below the tee and above the existing coupler above the tee and the reducer. Also cut off the small pipe that comes off the tee below its coupler. It's wise to eliminate joints you don't need for reliability, etc.
Slide a repair coupling onto the small upper stub.
Rebuild your intersection as you like, fitting the mate to the upper stub closely to it. You may be able to flex the upper stub aside to get the rest together. If not, see below.
Mark equal distances above and below the stub joint so you can visually center the repair coupling.
Apply cement and spin the repair coupling down into place with at least a full turn once on the cement.

Dry-fit everything first. If you find that you really can't flex the  upper stub to the side enough to make this plan work, put two repair couplings in that run, with a short pipe between. The last step will be to drop in that short pipe and cement the repair couplings.
Look, Ma! No rubber parts!