PolySynth is a magnificent synth implementation, one the best of its type I’ve tried. That filter & envelope follower play a huge part in that. I guess the ‘workaround’ for now might be putting PolySynth in a Parallel routing with another algo. With maybe unison Triangle waveforms to help disguise the synthy part.
I don’t know that any of the other algorithms present such a strong filter presence, and with that deep of a feature set. I can see the potential for that getting re-purposed in some future offering.
But you can try out a few others in the meantime, geared more toward a clean auto-wah effect:
