Good alternative for using your MTB shoes with your road bike too, and still be able to commute with your regular shoes.
There are some alternatives if you need a dual (click and platform), but these are light, Xpedo Traverse Duo Pedal real weight is 291g per pair (weighted by me). Are really well made, they look and work very well, and in the package you get an extra set of pins, beside the xpedo own cleats (XPC-Cleat 6°). I must recognize that I never had an Xpedo product before and not knowing much about them, I was pleasantly surprised by their quality.
The good part is you don`t need the Xpedo cleats (if you already have Shimano on your shoes), because Traverse Duo Pedal is compatible with Shimano SPD cleats. I use them with SH56.