I agree with everyone else, plus I'll point out how awkward it would probably be to tie your foot to a pedal in the first place.
If you really want to give it a go, maybe look for a bit cheaper setup to test it out on. A couple friends of mine who were getting into cycling found some of last year's MTB shoes on closeout for $30, and a set of Shimano pedals with flats on one side and clips on the other for $25. If you do a bit of digging, you can find deals. Worst case, you don't like it, and sell it all on CL for $40.
All that said, going to a set of platform spiky MTB pedals is an immense improvement over generic black plastic. Other than lifting straight off, once my feet are set on mine, they aren't going anywhere.