I wouldn't be opposed to a short trial to see how Blair does. OKC is actually a decent matchup for him given that none of their bigs really have a post game, so he shouldn't be as much of a liability of defense due to his size. However I think you've got to give Bonner a chance before Blair given that:
A. IF (and its a big one) Bonner is hitting his shots it will bring OKC's bigs out of the paint making things easier for the rest of the team, as opposed to Blair having to work in the lane
B. 3 points is better than 2
C. If Blair isn't a liability on D then chances are Bonner won't be especially since he doesn't gamble on steals as often as Blair.