I side-loaded the 32-bit version of the app on my Samsung Galaxy TabPRO SM-T900 12.2" with Android Lollipop (v5.1.1) along with the Universal Dictionary Manager (UDM) for a complete solution. Both work great together. I used QuickSpell Premium (no longer available) by MobiSystems for years, but it was just getting too old and Mobi dropped development. With LT, I finally get suggestions with newer apps (on my LG phone, too).
I, too, want to work on the code and customize it for my Samsung, but if you’ve gotten anywhere, you’d save me a lot of time (I’m in the middle of a complicated project right now, so I cannot get to it for awhile).
Let me know!