You're proposing what Early American Coppers already does. And we HAVE published our standards in the Grading Guide for Early American Copper Coins. The book received Book of the Year from the Numismatic Literary Guild in 2015. The real problem as I see it is in the infinite subdivision of levels of price at the uncirculated level. And for the most part, those only apply to modern coins. I'm not aware of any early copper coin that has been graded higher than MS67 by any of the "services," nor am I aware that any exist when graded by EAC standards. The coins are quite rare at MS65 and almost unheard of at higher grades. I would add that none of the "services" actually seem to understand coinage by hand using a screw press.