I enjoyed the read.
I'd first like to consider a very egocentric hybrid that can eliminate the need for MWI. Perhaps it is only "my" observation that can collapse the wavefunction and the rest of nature just follows Schoedingers Equation. This would make "me" a sort of god of some closed system, but into necessarily God. I guess that is similar to MWI but with no forks in the road.
We could also treat humanity as a collective. If our minds are together one perfectly coupled wave collapsing detector than there need only be one world, and one mind... collective free will? That would fit nicely with original sin and Christian dogma.