While I am a bit late to this parade, just thought I would add what I would do. Then you guys can tell me why it would or would not work.

The complete front sheet metal (less the hood I believe) can come off in one piece from the firewall forward.

(Here you already have yor front clip already installed.)

You could then (with help) slide the complete front sheet metal back into its original position with most bolts in (except for under the radiator support) with the front being held up into the proper position with either supports or floor jacks.

That will help you keep everything aligned while you make and install all brackets needed.

That is what I would do.