Trump hates Bezos enough to try to shut USPS to get to him. I'm sure he'd love to get the double whammy of screwing over Bezos and a boost from working class voters in swing states.
If that's how he feels personally, his appointments to the National Labor Relations Board don't show it. And if it would take legislation, he'd never get it past Mitch McConnell.
Your first point aside, Republicans have been trying to privatize the USPS for decades (though it's definitely the case that many Democrats are in favor of this too for whatever reason). The White House has been actively rejecting the idea of providing aid to the USPS over the last month or two despite the fact that the situation has demolished their revenues.
I think it's at least quite plausible that the WH could try to do this since it aligns with their priorities, and that McConnell would be fine with it. The House, probably not.
Trump has plenty of employees in his businesses, and support from lots of business folks. I would expect Trump to cut his nose off to spite his face at any moment ... but not if it meant using the federal government to side with a labor movement like this. He has likely made that choice already with his appointments.
> Trump has plenty of employees in his businesses, and support from lots of business folks.
On that topic:
For some, it was a plainly calculated choice. Thomas Peterffy, a billionaire who owned the largest estate in Greenwich, donated to Trump but never pretended to admire him. “When the choice is between two ideologies, then it’s a luxury to dwell on the personalities of the candidates,” he told me. “It’s a luxury that we cannot afford.” Peterffy, who made his fortune as a pioneer in digital trading, said that the choice was between “a high degree of government regulation or a diminished amount of government regulation, because, basically, that’s how the U.S. will get to socialism—increasing government regulation.”