It's simple to wire it in, it just buffers the serial data that you're feeding the CC-M. Drop me an email if you want one of these.
Improved R2LC/R4LC Serial Port Buffer
When you look at the buffer diagram below, the +5V, INP, and GND all come from the R2LC, I just solder to the pins on the motherboard below the R2LC or on the back of the motherboard. The Out is the buffered serial data that goes to pin-1 of J4 on the CC-M.