Not sure the exact status of the former Banff Gate Mountain Lodge & Spa (Harvie Heights), including the condos at what used to be Chateau Canmore, but if those are still operating then perhaps those would do... one flight of stairs to get to the bedrooms, I believe. BGML&S is west of Canmore, just outside the park gates. Good location for accessing highway 1, and probably 10-15 minutes from Banff.
Another option might be Banff Gate Mountain Resort (Dead Man's Flats), which is just east of Canmore. All chalets there are two bedrooms, with the master bedroom on the second floor and another bedroom on the main floor. Fantastic views mostly west down the Bow Valley, and it's really nice to have your own chalet, but it's a little on the rustic side there.
Sunset Lodges just changed hands....will have to dig out my e-mail on that. They're in Canmore, with 1-, 2-, and 3-bedroom units and an elevator. Newer and decent. We bought in since it was on an as-used basis, so we only pay a maintenance fee when we actually use it, up to 9 times (after our one use so far).
Hope that helps - would also vote against Panorama if you're looking for mostly Banff-Lake Louise, although we really liked the looks of Panorama when we were driving through Invermere a few years ago.
Good luck!