Izabella your trip sounds as though it will be wonderful, and keep my fingers crossed for you that you can organise it just the way you want.
Although we did the sanitised version / cruise, and went on
an organised trip, way back, 2001, for our 40th wedding anniversary. It included a 4 day coach tour through the Rockies, before boarding a cruise ship and doing the Inside Passage.
It was wonderful, especially the coach tour, as it was a new experiment by the company, to see how it was received. It was such a good offer, staying in a couple of excellent hotels, and the scenery was magnificent.
We both enjoyed the cruise, but could not disembark at one stop, as the weather was too rough. I would do it all again in a heartbeat, but unfortunately health problems now mean extortionate travel insurance.
Here's hoping you get to enjoy Alaska in the future, under your own steam.