Thread: A theoretical.
Certainly not any of them. The only one in the list there that does anything directly related to synths is Electro-Harmonix, with their Clockworks clock gen/divider box.
If I were to look at stompbox makers who could do interesting modules for synth use, I'd be holding out for Chase Bliss, Rainger FX, or Glou-Glou and certainly not any of the mainstream MI companies. They already have their markets sewn up with the guitar market.