IMO the way to go is to basically develop a sort of Cybernetic symbiote AI, the conciousness of which develops like an organic entity from being child or pet-like to being eventually a complementary sentience. BUT its locus be unavoidably attached to a physical implant and/or that implant's interface with a human brain. if its designed such that its existence is dependent on the health and well being of its host, and its entire concious and pre-concious existence basically exists as a companion to its host... I think it intuitively would have its interests be aligned with the interests of the host. I think that there would certainly be hazards in this approach, avoiding it overtaking the host, just being a yes man genius that would support anything that the host wanted regardless of morality or danger...

its not a perfect idea as presented, but IMO some sort of both literal and figurative symbiosis would be the safest angle to come from overall. at least then if everyone has their own personal AI with goals/interests aligned with theirs, then that would be a start to their being on our side, rather than a machine god that we hope is nice? or at least we have helpers that are at that level but on our side.