I'd say probably push, but I like either one.

Something I think nobody's thought about yet is, I know if a shortstack who has a decent amount of chips, say at least 40% of a full buy-in pushes, and someone calls, I generally see that as a sign of strength. Depending on just how small the shortstack is, if its still a pretty significant sized stack I think you might see that third person call more often by pushing than by calling.