I think it'd work. If I were to do it, I'd have two main concerns:

1. The pedals are so small my feet not be quite centered enough and might slip off at some inopportune time. I've had this happen when, in a pinch, I've used regular SPD pedals with normal shoes.
2. The pedals might be very slippery when they are wet (could exacerbate 1). I ride in the rain and snowy conditions; non-issue if you don't.

There are also other pedals that are cage/platform that don't have such pronounced teeth - both metal and plastic that would be a lot cheaper. However, if you really just want the A520 and like that look, and have seen someone else do it, you know it could work.