Yea I really like the idea of mixing synced with unsynced, or polymetric or even poly-tempi, especially with a vocal or melodic part, so it can “groove with its own groove,” so to speak.
Modcan QuadLFO + Make Noise Tempi + Syntherks SP-4DP quad active fader is my current modulation madness. (Just bc i already own the modules; I’d love to try your suggestion.) Tempi is great for polyrhythmic and mutated stuff with CV control of the switchable states as well as clock rotation. I think Synthwerks stuff is awesome and very overlooked. Stuff that’s made to be touched, that can leak, blast, and shape modulation signals...the controllers also make viable parameters still reachable once there is a rainbow hedge growing from my eurorack. Can’t wait to try w the Fumana