I can’t believe that I left the HarPeggiator out of my examples above. It’s virtually a multi-FX box in itself, and it’s a perfect fit for ‘series-parallel’ routings with a couple of H9s. Depending on whether it’s configured as a slicer, pitch sequencer, filter FX, or whatever, the placement can be either 1st H9 or 2nd H9 (or both!!! ).
That sounds like you’d be crossing the streams!
Thanks for these fantastic answers.