Hello,
Very promising indeed ! 
Which version of Krita are you testing (32 bit or 64 bit ) ?
I suppose the most difficult part for you will be the Windows version of this PhotoFlow - Krita plugin…
BTW, at present, G’mic (version 2) has been re-coded from scratch ( from Gtk to QT). As a result, it should be easier for Krita developers to include this new version with Krita in the future.
In the past, the Gtk version of G’mic was a real pain in the neck for Krita developers because it was quite often broken on Windows (on Linux, it was much easier to update…).