Quest for the simplest zero voltage switching

All,

I'd like to do proportional control on a 120VAC, 1.5kw heating element
(capacitive load) as simple as is possible. Ideally, I'd like to have
a single pot that I could adjust from zero to one hundred percent duty
cycle input to a zero voltage switching controller chip. This ZVS
controller chip would then control the Triac swiching the load. I've
found several chips out there that provide zero voltage switching but
only one that DIDN'T require a dc voltage for operation AND simply
allowed a pot to be connected to the control pins, the Motorola
CA3059. Or at least, it was the only one that had a circuit in the
data *** showing such a configuration. Unfortunately, its
discontinued and I cannot find any suitable substitute for its
operation. The MOC3081 seems like a possibility however it requires a
digitial input control. This would mean some kind of timer circuit
(again DC would probably be required) unless I'm missing some obvious
passive solution to providing this input. Any help from the power
circuit design pro's out there would be greatly appreciated.

.