Anyone here ever have their pistons machined?

With all of the various issues that I have dealt with trying to stop the detonation in my 440/493, I am considering all options.
I spoke with Dwayne Porter several months ago. One method he suggested to reduce compression was to have the combustion chamber sides of the pistons milled and to deck the block to zero. The pistons would allow more combustion chamber volume to reduce compression and the cut in deck height would increase quench.
Anyone have an idea on how much it would cost to have pistons milled? Mr Porter thought a .040 cut would be enough to lower compression about 1/2 a point.
NEW dished pistons from 440 source are $600 plus rings, then I'd need to have them swapped onto my rods. Cutting my pistons seems like a cheaper and easier way to go.