While the statement that you need a thin wrench to install the base pieces for the MKS is correct, it is not something I carry on the road either. I have cone wrenches in my shop and those do very well. It is only an issue at installation or removal, not roadside.

If you do a search, there is a fellow that took straight shimano SPD pedals and machined an axle that would fit the MKS. It was a nice piece of work.