Could you use a piece of thick leather to make the "D loop" backing and attach the Tandy Celtic conchos to the leather backing? Or you could take a metal "D Ring" loop leather around the straight shaft of the ring and attach the Celtic conchos to this. Also based on your design you could just use a leather FOB.
Last try flea markets and antiques shops. I have seen old watch FOBs that might be interesting for this purpose.
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