Here's how I did it with my Hellbents.
Note, this only works on your style Pivots, not the old true turntable pivots.
Buy the wide brake for a PX12
Squeeze the 2 legs together and they will pop out of the actual pedal bit that pushes the brakes up
Do the same to your Pivot brakes so you're left with just the pedal bits
Insert the wide brake legs into the old pedal bit, it takes a bit of fidgeting but they go in eventually.
Or you could bend yours. The original brakes are freakin tough, I've heard of them getting bent over some crazy skis.