High End has the new DP-8000 which can send Artnet. I am using one of these now at my home office to program Catalyst and lights on ESP visions. Before I would use a DP-2000 (or 3) and then a stack of DMX to Artnet boxes.

Sorry, but this is pretty much the only way to do it. You don't technically need a Catalyst dongle plugged in but you must have a DMX processor and artnet converter or a processor which does both.