When I was considering ditching SPD, I got these super-cheap pedals to test out platforms at the lowest-possible amount of at-risk $$.

It's been over a year, and I'm still commuting on those pedals, even though they are super-crappy. They benefitted greatly from opening them up and putting some grease on the bearings and closing them back up with reasonable preload. The axles got a little bent pretty quickly, and I lost one of the bearing dustcaps.

The point for you though is, the 'pins' are not replaceable, they're just bumps. And they are made less sharp by the coating of paint. But I find they still allow me sufficient traction with sneakers.