Hello and welcome to this great forum!
Funny to read that you are tinkering with a dark fantasy version of Frostgrave. I once attempted the same (it can still be found with the name
Raubvogel in the Frostgrave subforum) but it went totally beyond tinkering and in the end it almost became my own game system.
Due to limited hobby time and because I found that fluff writing was the most fun I had to scrap that project and focus on getting other wargaming projects and more non-wargame-y writing done
Anyway, with the LAF you found an absolute gem of the internet! Enjoy!