I'd consider it, but without a whole lot of backing for the specific application it'd be tough to do.
It might be more helpful if you your friend released "normal" coils for the Z first, and you put out a custom version of those..at least, assuming he plans on releasing coils for the Z.
People are just usually wary of new stuff, and like to snag stuff after other people have already reviewed it. A limited edition helps pick sales up when they've started to drop off.
Not trying to be a downer, just offering my thoughts.
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