For the sake of clarity here is the definition of Tri-Compax from the horse's mouth:
The purpose of posting this is to correct the common misconception that Tri-Compax means 3 sub-dials.
Unfortunately you are going to have to be extraordinarily lucky or have fairly deep pockets now that the Universal Geneve examples have been hyped by Hoodwinkee Hodinkee. I don't know about other makers; perhaps JLC?