I am working on a child device driver was trying to get it to report to Alexa as a Switch instead of a Light, so I tried to use RelaySwitch which worked great for the google skill, but then on Alexa it just gets totally ignored, does not show up in the Alexa devices at all. If I change the capability to Switch and removed and re-add the device in the Echo app it shows up on the Alexa devices.
Side note, I think I figured out that by using "Switch" and removing "Acutator" (I have no idea why every switch driver has this anyway) it will show up as a switch.