As you probably know -- a road cleat has three holes, a mountain bike cleat has two.
Hate to say it, but if you want to ride the mountain bike pedals, you're going to have to use mountain bike shoes. If the ones you have aren't very stiff, buy a pair that is. I use carbon sole Shimano mountain bike shoes, and they are very stiff. They also come in wide sizes.
I used to do a lot of commuting and found that mountain bike pedals/shoes were much more convenient. Especially walking across marble lobby floors.
Hate to say it, but if you want to ride the mountain bike pedals, you're going to have to use mountain bike shoes. If the ones you have aren't very stiff, buy a pair that is. I use carbon sole Shimano mountain bike shoes, and they are very stiff. They also come in wide sizes.
I used to do a lot of commuting and found that mountain bike pedals/shoes were much more convenient. Especially walking across marble lobby floors.