John , back in the old days, for a three day weekend, we used to drive down to St. Mary, arrive about noon and commence a three day tour, St. Mary's to Marias Pass, to West Glacier and then up very early in the morning to ride up the west side of Logan Pass before the road closure, then down to St. Mary.
I've never done it with a Rohloff bike, but that is a good thought, I should try it!
The newest Rohloff doesn't have a bike yet, so I think it will be next year before it hits the pavement.