New version that works without root
Download --> *Redacted link*
Install as a normal apk and set Material theme in keyboard settings.
Play Store Version
*Redacted link*
Thanks! Works fine on my GT-I9500 on 4.4.2 stock TW. The apk on Dev-Host is not zipaligned by the way though. Maybe it's a placebo, but after I zipaligned it the gesture trail animation seemed so much smoother. And I also noticed the option in Advanced Settings to hide the launcher icon in the drawer is absent. Strange that they removed it. Attached is the log of the zipalign check.
P.S. I redacted the links in your quoted post because I can't share links on the forums yet.