Anyone increased backspace via machining rims

'72 Dodge Dart has American Racing Boulevard 17" x 8" front rims. Tires are Nitto NT 555, 245/45 ZR17 95W

The tires rub at dips and hard cornering.

I am considering machining the rims to increase back-spacing by about half an inch in order to move the tires inward and clear the fenders.

I anticipate that because of liability issues the manufacturer would not recommend this procedure.

But I brought a wheel to a veteran machinist who said it might be possible. There is ample material to remove 3/8 " from the inside face of the rim, but that will also remove the half inch or so of space at the bottom of the lug holes that there is for the lug nuts to clamp on to to hold the rim in place. He said it could be possible to bore out the lug holes, thread them, and screw and glue inserts which have the proper step at the bottoms to resume the configuration necessary to bolt the wheels down.

Has anyone ever had any experiece in increasing backspace this way? Or any other way?

The machinist said it would be roughly $ 100.00 per wheel, which is better than $ 500.00 per new wheels and tires.