They are not exactly cheap, but the Tioga D-Spyder platforms have pins that screw in so you can pick the number of pins you use.
I've added two pins to the top since this pic was taken. I only have 2 on the bottom and have never had any issues with my foot slipping off when getting across an intersection when I have to start from a dead stop in traffic. They don't have the sharp edges or "teeth" that so many of the platforms have. The cheapo plastic toe clips are easy to get into and out of and actually allow for some power on the pedal upstroke, as well as pull through the bottom of the stroke.