Backport 10.12 kext for fiji video cards?

Hi all, I just finished installing OSX on my computer, after hours of work. I notice that my R9 Fury card is almost recognised, unfortunately there is a glitch that prevents many parts from displaying correctly (a slow refresh effect). I just read somewhere that 10.12 brings Fiji support, how likely is it possible to backport these drivers and make them work on 10.11.6?

Thanks a lot