I really think you are overthinking this. While on the road you will have the electronic tools, plus presumably you can pick up a paper map at the airport when you arrive, you should be able to re-route as you see fit once your feet are on the ground. If you hear something is scenic, then re-route on the fly. If it is foggy or rainy, nothing is scenic.

I have only put a lot of effort into every detail when there are minimal places to stay the night and a long distance in between. Otherwise, I do not like to put too much time into pre-planning, as I am often changing my plans.

This is your first tour, so I understand the level of pre-planning you are doing. But you likely will find road construction or other reasons to re-route later.