Comment by ups101

Shortest version: "Could you use X?"

Three advantages: First, studies show people like to say no more than yes. This fits a no, perfect for the knee-jerk denial, but most would follow up with a reason. As the reason is formulated, one may realise the initial assumption is wrong. However, at this point the person is discussing with himself. This is exactly what you want: The asker is out of the picture; the parades are down.

Second, an answer in the negative does not reflect poorly on the asker, as the question does not speak to preference. He may already be inclined towards a no, but just want the reason for X not being the better choice. Hence, less chance for a follow-up justification leading to a discussion.

Third, it merely establishes if X is feasible. Higher chance of finding common ground when discussing feasibility without preference.

Lastly, it doesn't get much shorter than this. Less words is less skin in the game.