[Dominik]

What is your camber setting? You get about 3/8" per degree at the shoulder of the tire. While it will not correct for one inch, it helps a bit.

I can't recall how much "meat" the 6-pin have which you could mill away.
If you go too far in milling the wheels and need to shorten the pins, you may run out of hex inside the pins to tighten them.

I suggest to contact the wheel manufacturer about how much you can shave off. Does Lynn still own Trigo?