When I was in my apprenticeship we used to call a mobile on-car disc machine company. They would turn up machine the discs on the car and off they go.
Just whip off the callipers is all you need to do. They may or may not still be around/legal.
I might google out of curiosity to see if they are still around as my jeep may be up for a disc skim in 12 months time...
Edit: these are still around... good to know.
http://www.brakediscmachining.com.au. Must be one in most states/towns