Is there anything you particularly want to see in Calgary? If not, I'd give it a miss.

You can get up to Jasper in 2 good days. Unfortunately there is not much choice in non-camping accommodation past Kamloops. Clearwater is often cited because it is by default the only other place midway.. Note, the stretch between Hope and Merritt is being rebuilt. Not sure when completion is scheduled for. Also check the status of the Kicking Horse project for the stretch between Field and Golden (highway might be completely closed - doubtful in June - with a lengthy detour.

Not much accommodation choices between Jasper and Rocky Mountain House other than at the glacier ($$$$) and at Saskatchewan River Crossing (probably $$$ and not very good) and rather boring to Calgary.

Might suggest looking at posts at Tripadvisor for suggested itineraries. There are certainly other ways, even interesting ones, to get from Lake Louise to Vancouver. Come up with a day-to-day proposal and we'll sort you out.

Also, try not to rent at the airport or Richmond due to various surcharges, and drop-off at airport with city pickup shouldn't cost extra. And don't plan on a travel day to get to the airport for a same day departure.