There are at least two alternative launchers within the Amazon app store which can be installed on the KFire. No hacking required.
- Go Launcher EX
- Claystone Launcher
Attached is a photo of my KFire running Go Launcher EX. After you install an alternative launcher, whenever you press the Home button you are given a choice of which launcher to launch. It is easy to switch between multiple launchers.
Unfortunately you do lose some functionality with Go Launcher EX. I've not tried the Claystone Launcher yet. For example, you can launch the Kindle reader app but because it does not have a Library screen like the Kindle for Android app you cannot change books. I suspect there are many other drawbacks too. But the idea I'm getting at is that some smart developers could probably figure out how to customize a launcher that can replace the stock KFire launcher without losing any of the functionality of the KFire. One can hope anyway!