Sorry no one from Eventide has responded to this Univibe thread. We've been talking about it, and we're planning on having someone take a look at this and try to figure out how hard of a modeling problem this will be. This won't be our next algorithm, but given how many people have been asking for it, we're going to look into it.
As an owner of an original 60s unit (and a few Fulltone versions) I would add that the half phaser, half chorus effect is crucial to me. The Boss MD500 does a passable simulation which I ride with the expression pedal. It was arguably the thing that tipped me towards the Boss unit and away from others. That said, there’s a low end throb that isn’t there when the speed is high so there’s scope for improvement.