Sounds like a better idea than I had.
I was prepared to take the bumper completely off and fix the brackets that way.
Don't even try that shit!!!! It will only piss you off! I don't know why, but that bumper IS ON THERE!!! Really well!!! LMFAO!
Just jack that ***** up. Don't even mess with the bolts! Trust me.
(Just be mindful of what you're doing.)