A few years late to this thread but I have my LiftMaster 8500 working with Lutron RadioRA2 Visor Control (RR-VCRX-WH) using the creativeaccesssolutions.com]™-Interface-Module_p_13.html">Universal Security+ 2.0™ Interface Module.

One pair of the wires plugs in to the same red/white blocks as the LiftMaster Wall Mount Opener wires. After it's plugged in, you short the other pair together a couple of times and the garage door will open. You then take this pair and plug in to one of the Outputs of the Visor Control.

Works like a champ.