Your preamp-to-amp wiring will be single-ended regardless of what kind of connectors are on the ends. Seems to me you would be better off using a rca-terminated interconnect and the adapter at the amp. If you were to make a cable/adapter such as you describe why not make it long enough to go all the way from preamp to amp? Most any cable manufacturer will make what you want. I have used A2Z cables (on the web).
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