For Calgary, there will be a check box in the application giving you the choice to invoke the 10 year exclusion rule (ie. it is optional). Given that it sounds like using this rule for you would not give you a calculable GPA, you should not click that box.
The 10 year exclusion rule is unique to Calgary, so UofA does not use it.
You are right that Calgary and Alberta are likely your best shots as an Alberta resident, but some Ontario schools do not consider province of residence as long as you are a Canadian PR/citizen. I would take a look at each schools' website to see if applying