Update: I added AJH Wave Swarm and Xaoc Minsk (stereo width & m/s FX) to my setup. Initial experiments leave me 60%+ satisfied as far as unison/stack/detune/spread goes; it's not getting me the super-stack sound I would get out of Serum BUT its a considerable step in the right direction. I'm wondering if I will be able to further "tune in" my setup and patches for a more satisfying result. Again the reason I'm using WS+Minsk is to be able to do this to ANY waveform (and not just rely on a supersaw module).
If ya'll have any further ideas / comments, I'll be interested to hear. Thanks!