unilugs

personally, i do not like the design

but, your not the first to think of metal fillers, to make them "less unilug"
in fact, i believe each wheel manufacturer has their own specific washers for this

still not sure i like it though, but here is a quick example

20 LUG NUTS OFFSET WASHERS 1/2 INCH THREAD FOR CRAGAR SS WHEELS .80 SHANK UNILUG | eBay