Why dont you just mill them? I can help you out with a shop in Australia if you have nowhere that is capable in your country, and are willing to courier the forks here. Milling would cost only $200... and you get to use sexy current generation calipers, instead of old HPK...
http://metalgear.com.au/mgear-brake-disc-front-black-centre-p-11023.html 330 mm sc44-sc50 http://metalgear.com.au/mgear-brake-disc-front-alloy-centre-p-11116.html 320mm sc59 http://metalgear.com.au/mgear-brake-disc-front-gold-centre-p-11025.html 310 mm sc57
