I'm going to still make a batch with the six i can reach: those i will peel as some recipes advise, and then i can see the difference. I'll leave the spices out because i do have a suspicion that the flavor might just be from the spices. So this year, get a sense of the nut flavor in the alcohol. There seem to be plenty of other things people make though, like black walnut ketchup.
Anything other than dealing with the ripened nut's iron shell.