I have Shimano PD-M540 Pedals on my Trek 1000. I would like to put an additional set of this kind of pedal on my indoor exercise bike so I can use the same shoes.

For my indoor bike the pedals don't have to be as nice as the ones on my Trek. Can you recommend a less expensive pedal that is compatible with the PD-M540's? Also, if the pedals had platforms on one side and the clipless mechanism on the other side, that would be even better.