Peter, you are already bringing back so many memories. I love the Glenn Highway and the Matanuska Glacier region. Must also say, I am so fortunate to have my own vehicle. It goes where I tell it to go, without restriction.
The first time I went to Alaska (2004) I rented a car in Seattle, and was told I could take it anywhere north of the Mexican border. I'm sure the gentleman did not expect this senior female to take it to Alaska. I never mentioned Alaska to them. No mention of forbidden roads either. I did not learn about that until I got to Alaska. On that first trip I stayed on the main highways, which filled the 18 days I had to make sure I got the car back in time.
It may be expensive, but no-where near as expensive as the true last frontier - Antarctica! Alaska is a magnetic place.... calling you back. It was good to read in your first paragraph that it is not out of the question. After four trips, two in my own vehicle, I long to take another trip, but alas! I doubt it will happen. All good things must come to an end.
Can't wait to read more of your trip.
Lifey.