War doesn't have many buttons, same for drk imo.
If you really want to play gnb, maybe you can change you keybinds that way :
- I use a azerty keyboard so for me it's like 1,2,3,4,5,e,r,t,f,c,x,v( i use zqsd to move). I use "a" and two mouse buttons (S4,S5) that are not influenced by ctl, alt or shift : they are buttons for spamming/quick usage (you can do this for the continuation skill).
Here's how it's like in the end :
https://imgur.com/pNzwRTP

It's not much but i hope this can help you