I'm sure something similar, sized to fit your van, would work.
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Also SPD's have always had 6° of float.
Do you have a link that says that? I checked several listings and... They all said that SPD as 4 degrees and SPD-SL as 6 degrees.
Note that both real Shimano and Wellgo list 4° of float for non SL models which are a different product entirely.
Float is also useful for those of us whose legs are not perfectly straight, causing the heel to move in and out a bit as the crank turns."
That is why I said "often", but I have to wonder... How often is that heel movement just a result of poor fit or bad form?