Someone else may have a better answer but I don't think you'd find an easy way to do this using the Express Receiver (EX/RX) Ver 2 unit. When used to add wireless to something other than an Lynx Express it uses an 8 pin DIP adapter and it in effect replaces the "RS485" chip on that device and draws it's power from that device as well. Here's a link to information on that modification. http://diylightanimation.com/wiki/index.php?title=Mod_Wireless
I think you'd be better off using the Wireless TX/RX Ver 2 unit http://diylightanimation.com/wiki/index.php?title=Equipment#DMX_Wireless_Devices set as a receiver and just connect it to your LED string driver with a Cat 5 cable.
Just my humble opinion.
Alan T