No miles required for an elite on that route. :-:

As for changing just the one segment, the concern I'd have is the fare break you'd see if you switch from IAH-OGG in W to IAH-LAX (??) + LAX-OGG (B). There's no guarantee that it would stay in the cheap bucket - especially on IAH-LAX - so who knows. It can definitely be done. It is just a matter of how much it will cost.