Turning cake mix into cookies - advice please

I guess it should turn into something cookie-like and edible. I don’t know if you need water at all, most cookie recipes have only egg and vanilla as their liquids.

What will the filling be?

Are the almond flour and coconut for flavor only or are you trying to add protein or fiber or something? It’s just that they may make things more dry and crumbly or harder to work with, and a few drops of almond extract would be more effective than almond meal.