It would be hard to predict the results...
Number one, if a wax contains any cleaners, you can't layer it on top of itself or anything else...
So, assuming no cleaners, I think you would rarely be able to predict the end result of combining waxes. For example, if you liked the deep, wet look of Souveran and the flake pop of SSII, combining probably wouldn't give you the best of both worlds, in fact you might get the worst of both. Light would now have to travel through 2 layers, the layer of Souveran might keep the flakes from popping, the layer of SSII might detract from the deep wetness of Souveran... then again, you might like the resulting look, who knows.
Just saying that I don't think you can create the perfect look by picking multiple waxes and hoping to see the best of each in finished product. Chances are, you'll actually end up with something less than any of the individual layers.