I'm building a bike that I'm going to be using to commute. I'll be using toe clips and straps for doing this.

I also want to be able to take the bike out for longer rides while using clipless pedals.

Would it ruin the pedal threads on the crankset to swap the pedals off and on a couple of times a week?

As a side note, if you're riding with toe clips and straps in the winter, how do you keep your feet warm? With a plastic bag between your socks and shoes?

Thanks.