Likely not as OTA updates probably won't work. So you would be stuck on an old FireOS build. There are historical posts scattered in various threads that discuss attempts to reenable OTA; as I recall most were unsuccessful.
I think not given the hardware specs of this device far exceed those targeted by Android GO (discussion). Real world performance with a custom ROM exceeds most budget and even some contemporary mid-range devices despite being a 5 year old design. GPU is the weakest link; nothing can be done about that.
Seriously? You expect someone here to create and post a stock image to just cover your behind?