And that's where we come full circle.
Make them O's, and they'll be operating outside the purview of what officers do, which is keep a chair warm and take credit for go/nogo of their subordinates. Not something you'd be hunting to do with these guys.
Enlisted doesn't pay them what they're worth. GS wouldn't really pay them what they're worth either, and there's nothing that makes it so people have to listen to them, either.
Contractor, AWP can handle that nut roll... just because you have technically competent if not stellar personnel as your contractors, your AD staff may very well just blow them the fuck off.
So, the only valid solution is Basic/WOCS with a technical proficiency bonus/additional pay. After all, when the Warrant walks in with a cup of coffee and says "yeah, um, no don't do that, let's do this instead" it doesn't matter what rank you are, you listen because that guy knows his shit.