What about the F(x)tec Pro1 X? They list LineageOS compatibility on their front page.
Also, it looks like a great phone.
Looking at specs: SD662 6/128 829USD
The hardware BOM should only cost ~200usd. The rest is software sorry/markup for being a small company with limited volume. Not great value and a horizontal keyboard isn't my thing personally but I'm glad they're competing!
Depends on what your values are, I guess.