Fair question. Before coming to the Orioles, vs. RHP O’Hearn had a .706 OPS (.228/.302/.414), whereas as an Oriole he has an .842 OPS vs. RHP (.303/.342/.500). So, that’s an OPS improvement of 136 points.
Versus LHP, O’Hearn was a .492 OPS hitter in KC (.163/.244/.248). As an Oriole, he has a .192/.206/.538 OPS vs. LHP for a .744 OPS. That’s in 34 PA, so tiny sample size there.
My inclination is to think that given more PA vs. LHP, O’Hearn might improve from the .492 OPS guy he was vs. LHP to something like a .650 guy. To me, that’s not good enough to bother with. I’d just leave him in the role where he’s excelling.