I interpreted your question as asking if the US could use SpaceX's rocket manufacturing capacity to produce ICBMs that could be used to hit Chinese ships.

Now that I see that this was not what you're suggesting I don't think that two years is a sufficient time frame to build, test, and deploy the kinds of weapons that you're suggesting.

It seems like America is sleep walking into a horrible conflict with China and this combined with all of the soft power that America is losing in the past few months doesn't bode well for the outcome of this conflict.