ASR and burgard sell arms that utilize a banshee spindle. burgard arms require reaming of the spindles. they will do them for a fee. ASR you have to ask for banshee style upper ball joints. as for reaming of the spindles, i am unsure.
doing this, you can run banshee hubs, and hydro brakes with no issues, or fab work. it becaomes pretty much a bolt on type deal. but im sure you already knew that, or could figure that out.
those 2 companies are probly your only and best bet for doing such a modification.