I've made my hardware sequencer selection. My choices eventually converged to two scenarios:
(1) Squarp Hermod - 26HP and about $470 USD
(2) Ornament and Crime and Varigate 4+ - Also 26HP and about $440 USD
I went with Ornament and Crime/Varigate 4+.
Ornament and Crime's software is open-source, and I've been able to pretty much bend the thing to my will. So if I ever have a crazy idea (like modulation sources based on cellular automata*), I can make it happen right away.
Varigate 4+, on the other hand, is a more traditional modular sequencer. But it has some extra features, like four tracks, clock division and multiplication, glide, and various types of quantization. It's not as straightforward as was my Moskwa, but it's nicely-balanced.
The basic philosophical underpinning of my decision is that I want composition to be process-based rather than an end-to-end act of intent. Hermod would have supported the opposite philosophy quite nicely but, in the end, it isn't what I want to do.
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* As in