I've always regarded these scenarios as a basis for an interesting game without having to think too much about the scenario and if you chose to change it that's fine and if you get a good game then that's all the original setter would wish, so go with your desire.

I enjoyed this as designed but I can see the way you're thinking and I'm sure that would give a good solo game just maybe a bit more work on the scenario.

I seem to have stalled on the next scenario, I started to play it and then realized I didn't understand the rules so will probably skip it. I'll be interested in your take on it when you get there.