How about starting with the 9 from hand, intending to cover with the ace to read LHO's mind a bit? Strictly speaking, this is inferior - only 12 for 16, losing against Lefty's KJ8, KJ5, KJ85 or void. However, with KJx(x) LHO needs to smoothly play low under the 9... any hesitation on his part would mark him with something, and we could change our mind and let the 9 slide. Not against the rules AFAIK, but is it ethical?