This is what I was driving at with my comments about Trump swinging more towards Independent status than being party line Republican. I can agree with all your points above, and that he would then be more likely to work with or co-opt ideas from Democrats in Congress once he’s started down that path.
Trump is angry at Congressional Republicans right now. He feels like they failed him, hung him out to dry on major issues and are responsible for much of his recent negative press. As far as Democrats go, Trump hates two of them, Obama and Hillary. As long as he doesn’t have to work with or say nice things about either one of those two people, he’s probably fine working with Democrats as long as it nets him positive press (which things Hurricane relief, avoiding government shutdown and extending DACA will do).
For their part, Democrats recognize an opportunity to score a few minor victories policy-wise while also rankling Congressional Republicans. I’m sure there is also an underlying thought process of “if we can tone him down a little, we’re all that much safer in the long run”. I am also 100% positive that it won’t last, and 100% positive that no matter how much Trump may move away from the Republican ideology, Democrats will NEVER adopt him as one of their own. They will tone down their direct criticism of him for the sake of getting things accomplished, but he’s never going to be a Democrat, or even an Independent in the same way as Congressional Independents.
Trump’s version of Independent just means he a chaotic neutral political force, out to do whatever he feels is best for him, without real regard for how it affects anyone else.