Abstain. I would have bid 4♥ (or 4♠, if no Texas) at my first turn, so I don't have this problem. At IMPs I suspect I will have good expected value vs any random hand partner has, and I don't want to give away anything to the defense on the auction. Giving that I am always bidding game, 1N-xfer-2-4 is at least a mild slam try and obviously I don't have that. I don't invite because I don't think I can intelligently get anything from partner... his trump quality is essentially irrelevant for one.