I have never heard of anyone doing that before. No you would not use e-wax to thicken, I use stearic acid to thicken mine. You would have to heat your lotion base warm enough to melt the stearic acid which would render several preservatives useless. Everything that comes in contact with your lotion should be sanitized as well. I guess depending on how much you have left I would just buy a thicker base rather than go thru the hassle.
Bruce