I think a 50/50 mix of beeswax and paraffin will do about the same thing as trying to find the stearin. More expensive candles generally have stearin in them to control the melting point.

I have had excellent luck with 100% paraffin wax dip on untreated leather sheaths. It is board hard and does not melt. It is likely too hard for sheaths that require some give for the knife to seat well though, so a mix with beeswax is what I want to do for my Grohmann sheaths.