Vern Little (vx aviation) has a stand-alone AOA display for the Dynon EFIS.
http://www.vx-aviation.com/page_2.html#V-Speed Auxiliary Display System
Jim
vx-aviation.com said:NOTICE: This device is currently out of production, but still supported. Please contact us for more information. Units are still available as custom-builts with 30 day lead-time.