Can't imagine what that would even look like and nothing I want to try. I could see cutting the mounts off and shifting them sideways similar to the BB k-frame mod, but I can't see slotting the mount itself. And cutting the mounts and welding them back on 1/8" to the PS is more work than slotting the k-frame mounting bolts.
I also noodled shimming the mounts some and I can't see how that could be done smoothly unless maybe a washer under the bottom bolts on the DS side and under the top bolts on the PS side? Not sure if that would work or even be worth trying.