C,
Just ask George which is better. What you are considering doing OR just buying a Lightspeed attenuator and another pair of less expensive rca's to bridge the connection. I understand where you are coming from wanting to keep the rca's of the same quality within the chain, but I'd bet the lightspeed with some mediocore interconnects will sound better than what you are trying to do. I could be wrong...
Ask George what he thinks. By the way, I have no relation to George other than being one of many, many happy customers. His lightspeed thread is one of thelongest here, with glowing reviews!