FYI, RCA-terminated unbalanced cables constructed with the same Mogami 2534 wire that is used in the Gold Studio balanced cables can be obtained here:
https://www.markertek.com/product/msc3rr/mogami-neglex-quad-audio-cable-rca-male-to-male-3-foot-blac...
Also, keep in mind that most cable parameters and consequently most cable effects are proportional to length. So the relatively short length you require is likely to make your choice of cables less critical than it would be in many other circumstances.
Good luck. Regards,
-- Al
https://www.markertek.com/product/msc3rr/mogami-neglex-quad-audio-cable-rca-male-to-male-3-foot-blac...
Also, keep in mind that most cable parameters and consequently most cable effects are proportional to length. So the relatively short length you require is likely to make your choice of cables less critical than it would be in many other circumstances.
Good luck. Regards,
-- Al