Are you interested replacing FireOS with Nexus or CM11 which effectively yields a standard Android tablet detached from Amazon's ecosystem? The work effort and risks (low) are similar for all three paths. All work with Safestrap.Yes it's still operational, although I had to install another launcher as after instilling Open Gapps I could not pass the setup wizard. Please note that I have Safestrap installed.
Sorry for the series of questions. Trying to identify the best path and minimize rework.