I find using a lye calculator is easiest as I've been known to make mistakes if I calculate by hand. Here is one site that shows you SAP values.
http://www.herbalbear.com/sapvalues.htmlIf your coconut oil has a chemical smell I wouldn't use it. The price of the coconut oil from the distiller doesn't sound too bad. If RB wax is comparable to candellia wax, I would try it at 1 to 2% to make a harder bar. You would need either coconut oil or castor oil to give you some nice bubbles. Is castor available where you are? I know I can find some here in small quantities if need be in a local pharmacy as castor oil is used for bowel problems.