K>I>S>S
that being said, use open long lug nuts, (forget the spike solution) they will leave unuse female threads you can crew into and decide whether to use 2 or 4 attaching bolts of same thread as the lug nuts, if say 12mm, center drill them to reduce weight, you will need something to back stop the cover so the cap fasteners can be tighten against something. Might want to safety wire say two opposite bolts to see if the other two tend to loosen in extended use. I feel leaving a 1/4"? gap between the outer rim and the cap would be best for longevity of the wheel system in OTR use or trapping water, etc without serious impact on your primary goal, vs no gap at all.
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