Considering the case it's in, your bracket really is perfect.
I still think a folded sheet metal prototype would ensure some recognition from future manufacturers. I think you can make an architype which simply can't be improved upon, from a production standpoint. They'll have no choice but directly copy your design, rather than claim it merely "inspired" them. You may not get royalties for this, but it it would open the way to a working relationship. This won't be your last invention.
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