Hmm. I think the issue with all these phones is that the modems can support those bands just fine but they’re generally tuned for Asian and European markets. Predominantly because those sorts of phones sell en mass there still maybe. For example, I have a duoquin F22 pro (think modern Nokia). I know that folks over on XDA have flashed CFW to region unlock them for US. You might be able to find what you want (the Cubots sound like a near match) quite cheaply but you’ll have to check XDA for CFWs first.