For me on all bikes only got hotspots with bad / worn out shoes since you state no singletrack, I am assuming superstiff shoes will be fine and you don't need to worry about hike a bike, just look for carbon soled shoes and dont worry too much about the pedals.
I agree...stiff carbon soles and proper insoles are more important than the pedals...especially on just gravel roads. Pretty much any brand of mountain cleat is going to be a similar size and contact patch with the shoe (shimano, time, crank brothers, etc).
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