It is definitely not worth having a cable made for this. You won't be getting the benefits of the balanced circuit anyway so the slight loss in performance experienced using the adapter will not matter. If you plan on upgrading your CDP with in a year I would suggest just staying with what you have now and put the money towards a good XLR IC, assuming you choose a balanced CDP to go with the AR. I lived with an XLR/RCA adapter for almost a year between my BAT CDP and pre. There is a definite improvement removing the adapter and taking advantage of the fully balanced circuit. And I was using quality BAT adapters. Hope this helps.
Dan
Dan