A three part question:

Let's say on 9-17 I'm flying Air canada EWR-YYR and I want to use the RCC club.

Can I go in as a member on an Air Canada ticket? I believe yes.
And the BIGGER Question: can I check in at the RCC Club on an AIR Canada Ticket. I think no.

Coming back: Can I use the Air Canada Maple Leaf Lounge at YYR as an RCC member with an Air Canada ticket?

Now that I've given you all a headache, I thank you in advance for your help!