relocating the rear bumper bolt to the rear is easy. Nothing difficult about it. Just measure how far you need to go back and drill and add a new bolt and nut if needed. I had mine done at a shop and when I looked at the work, it was NOT worth the month I paid. Since then, I've done it for my friends ride and a few other members in SoCal when I'm free.

I'm running a 265 tire on a 18x9.5 +22 offset with no issues DDing or tracking.

search up on other member's rides and you should get an idea of what to do.

 

Check the link above, it pretty much describes the whole process in pictures.

 

im running lower offset than the OP, but I didn't relocated the bolts.
what i did is cut/trim the rear bumper to the bolts, and then trim tap that holding the bolts.
with stretched tires and camber setting, i can get away from rubbing.

 

+1000

 

Before removing the bracket drill a whole further back in the bumper/1/4 panal flange and put a nut and bolt with washers in. Then remove the bolt in the flange that hits the tire and dremel anything that hits the wheel flat. This worked beautifully on my car.