I probably should have been clearer -- I wasn't taking COSM modeling into consideration... I was thinking more along the lines of an authentic circuit like the Deja-Vibe. Mabye they just didn't think they'd sell enough of them to justfy the effort, that it's more of a boutique thing now. Or enough players get close enough with a phaser of some sort.
The exp/ctr jack on the PH-3 should allow you to use an expression pedal to get the uni-vibe effect. I haven't tried it, but the uni-vibe is really just a rocker pedal phaser