Well, there’s quite a few sellers that are shipping overseas; like vireo.de in Germany, that is even shipping batteries as spare parts.
Before you decide to start your own phone company - especially one following the ethics and principles comparable to Fairphone -, do some reading on the blog of the Fairphone page (or on the blob of ShiftPhone). And take your time to go back in time to around 2013/2014. You will find, that there are some hurdles to take and you might find some mistakes to avoid.
Besides lots of money, it takes lots of stamina and a good team as well.
One has to be the adventures kind of guy to take on such a task. I know, I wouldn’t.
But, of course, I hope you will succeed, as there never can be too much development on that market. Maybe you even could cooperate with Fairphone in some regard.
Just my opinion:
Fairphone not moving to America seems a wise decision. Right now, they have launched their first phone for the mass market in Europe and have run into some troubles with the update to Android 10. That stuff obviously is keeping them really busy, as support is lacking in response time (at least).
Aiming now for another market, that requires not just a distribution network, but a support network as well, would be hazardous from my point of view. Besides that, they would have to design a new hardware (covering the bands) and the software would have to be adjusted as well. Add the regulatory and legal measures, they had to follow, and I would change my assessment from hazardous to suicidal for a company as small as Fairphone.
Once they have got a foothold on the European market and their business is in safe and calm wathers, they can expand to other markets.
That’s at least how I see it, as much as I would love to have those phones sold worldwide to make a change as fast as possible.