Get actual bolts I have them now on a set of specialised magnesium pedals and I still have every pin after about 5months and I'm not kind on my pedals. Where as I lost 2 grubs out of my dmr's on my fist ride on them. Plus grubs round of very easily.
If your really worried about breaking pins ect only have pins on one side of the pedal and take the others out as you don't really take your feet of the pedals when riding a uni for trials, well at least I didn't anyway.