We really need an Android alternative with no involvement from American or Chinese companies.
This won't occur without state intervention. The market has already decided to move design and production of phones and phone components to China (and Vietnam to some extent). In order for a European phone to be made, in Europe, the necessary supply chains need to be buit. But there's no market for them as their output would be more expensive and the market already figured the maximum profit is in the China-Vietnam manufacturing mix. So the state would have to create these supply chains. Minerals, displays, diodes, MOSFETs, ICs, caps, PCBs and small cells. Once that's in place, creating a European phone manufacturer becomes possible. That's a decade long process that simpy won't occur without deliberate and persistent state support. I think it should be done, however you may find a lot of opposition by free market fundamentalists, or interest groups that represent capital in other industries receiving state support.
On the software front, our fastest way to independence is a state-funded software org to fork Android and begin development and maintenance full-time. Whether one goes with non-Android or Android OS, it always comes down to funding development. Starting with Android would likely be significantly cheaper since a lot of work has already been done. And if you fund its continued development away from Google, then Google isn't a factor anymore. Make an independent app store, Play Services replacement, etc. As I said in another thread, the social infrastructure (people, labour) is more important than the exact technology used. If we have that, we can make a usable phone out of Android or Sailfish, or anything else. It's a matter of doing the work.
Having independent software with PRC-hardware isn't a bad compromise. Especially in the near term.