I don't really think they should trade Bohm. He's young and cheap. But I still think the roster construction is flawed and the other two RHBs are immovable. That problem will solve itself after one more year though.
But hypothetically? Trade Bohm for pitching or prospects, sign Turner to play 3B instead of SS, bring back Segura cheap at 2B. Or keep Stott at 2B and sign a cheaper SS who pairs well with Sosa.
Clearly the Phillies are content to have addressed defense with Marsh and an upgraded middle IF (regardless of where Stott plays) and that might be good enough. But "good enough" might also not be good enough. If they goal is to win the NL East and/or get to the World Series no position player on this roster is really untouchable or irreplaceable besides Bryce and JT.
I don't think the Phillies did trade low on O'Hoppe or Brown. O'Hoppe's ceiling may still be back-up and Brown's a pitcher (i.e. his floor is not merely "reliever" but career-ending injury). If Bohm stays as hot as he has been lately, he could be at peak value this off-season. But if he does that he can continue to play mediocre 3B for the Phillies, certainly!