“I bought these shoes recently, but have not invested in compatible pedals yet. I am currently just using the aluminum platform pedals that came with my Trek road bike. Are there any concerns with using these without the cleats with my platform pedals? I will look into getting new clipless pedals soon, but was just curious if this was ok in the mean time.”
Probably not if they do slip to much on your platform pedals. I would recommend putting some tape over the cleat mounting holes to protect the treads.