That is VERY cool! I will be messing with this soon enough 
I have Prime also but my need is to tinker and not super immediate. You should definitely start up a new device thread with the ESP8266. I may be able to help with some generic device which allows creation of as many buttons as you want in the child device and each button can have a different/unique function.
I just played with @blebson’s new D-Link code (awesome VIDEO integration) which uses child devices and it seems that the number of buttons and their definition can dynamic but not 100% sure on that.