As per others have already mentioned, if you are going to use SPDs, why use a road shoe? It makes much more sense to get a mountain bike shoe with a stiff sole. The method you have described here would be somewhat more difficult to pull off with road cleats.

Also, I see you have the A520 pedals on your bike. I used those for a while, but IMHO, they offer no real advantage over standard dual-sided SPD pedals. For the purposes of commuting where you need to clip and unclip often, it is much more practical to go with a mountain bike shoe + M520.

In addition, someone correct me if I'm wrong but I don't think that the SH70/71 cleats (pictured above) work well with the modern MTB SPD pedals. The A520 has the same clasp mechanism as the M520.

Cheers.