I doubt Ainge is that interested.
He apparently didn't want cousins because of attitude issues.
He apparently isn't interestred in a guy like Monroe because he doesn't shoot threes.
He apparently isn't interested in Melo (I assume because he dosn't defend and needs the ball in his hands)
Okafor has attitude issues, doesn't shoot threes, doesn't defend, doesn't rebound AND needs the ball in his hands to be productive.
And he has the agility of an 80 year old broke-back tortoise.
Can't imagine Ainge would have much interest in him for any reason beyond sheer curiosity (due to his youth and size) - and knowing the way Ainge overvalues his assets, I can't imagine he'd be willing to give much up for curiosity.
He'd probably throw a lowball offer (maybe the Celtics own 1st rounder and Zeller, if that) and if they say no he's likely to say "ok fine" and walk away.
If he wouldn't give up Crowder for Jimmy Butler, I don't see him giving up much at all for Okafor.