But Fairphone Open is not an OS done from scratch. To my knowledge it is a basic Android (or Fairphone OS) without the Google stuff. FPOOS in this regard was a derivative of FPOS.
I have no idea, if your idea regarding Lineage OS is in any way feasible.
Would be interesting to learn what the LOS community would think about a company trying to take over control. This - to me - seems a bit contradictory.
And finally the statement posted by @AnotherElk stays valid whatsoever.
You never would get this phone sold to the mass market, when it does not offer Google services. There are quite a lot people out there using e.g. location services, Google maps, playstore and cloud all the time. They don’t care to bother with MicroG and stuff like that. They want a phone like all the others.
That’s at least my experience and impression.
Hope and Official are a bit contradictiory as well, don’t you think so?
Plus this sentence
Since this is a hypothetical poll about future FP models
should clarify, that this is nothing official.