Road Cleats on Gravel Bikes?

[mcneese.chad]

We discussed a version of a rigged MTB Shoe + Road Cleat combo for this very purpose.
Probably a terrible idea, but I have a pair of shoes waiting to die, so I will try it some day soon.

Mountain bike shoes with Look Kéo cleats

I’m looking for mountainbike shoes which will fit Look Kéo cleats. Because I do not want to drop my Favero Assioma pedals when I want to ride some gravel or easy singletrack. Does anyone have any experience with a setup like this? Or any tips?