The problem is that 'what they need' is likely a big percentage of 2Q US S/X sales. Best guesses had them at 162k as of 1/1/2018. Assume Q1 isn't a disaster on S/X and that's 175kish. Plus all 3 sales on Q1, so say 182k conservatively. To not get 18k sales in the US in Q2, you have to bet that they will sell only a few thousand S/X in the US all quarter, and/or that they are knowingly bullshitting a huge number of Mar-May reservation holders. If they start Q2 at 2k/week 3s and just stay there all quarter (which, recall, would be a huge miss--this is being very conservative), that's 24k 3s alone. So between 24k 3s and the usual 13kish S/X that usually hit the US in recent quarters, you have 37k vehicles. So 20kish of that would have to be directed outside the US, contrary to usual (with S/X) or stated plans (3).
Maybe it'll happen. It just seems like a big ask to me, and with a large potential for blowback. Sure, it'd extend the credit for some people, but it's also nuke the deliveries of many others.