So: Last night I worked on running the few apps I have from the Fire TV through the APK4TV tool posted on here. Unfortunately the news isn't great.

In theory it should solve the problem with FireTV apks crashing due to problems with how the apps are signed by resigning them for Android TV leanback. HOWEVER, the APK4TV tool isn't able to fix the problem. It throws up an error no matter what app I run through it (IkonoTV, WatchESPN, HBO Go for Fire TV, Netflix, WatchABC etc). Apparently the tool cannot resign apks that have been signed for TV use already (in this case the Fire TV).

So, that's frustrating. I'm going to experiment with the old apps for Google TV. Maybe there's something useful there. More to come.

EDIT: Just ran a few Google TV apps through it, same story :/