Good morning:
From Super Formulas by Elaine C. White,  the following recipe is available
Grafting Wax
10 ounces(weight) rosin
2 ounces(weight) beeswax
1 ounce(weight) charcoal powder
1 tablespoon linseed oil
 
From Beeswax Crafting by Robert Berthold Jr., the following recipe
"Beeswax can be used to make grafting wax equal to or better than anything
available commercially. Warm and hand knead equal parts of tallow(rendered
beef from rendering plants or butcher plants, possibly fast food
restaurants) rosin and beeswax."
 
I have not used these.
Best wishes,
Keith