Ah, that'd be it then; it would've been such a cool experiment.

Regardless, I don't really know if there's the notion of an SMP-enabled m68k board based on Linux so I would not really know where to start.

For SuperH, I've gotten very lucky because there's a single CPU subtype (J2, https://j-core.org/) which has SMP tidbits that helped me understand what to look for and where in terms of wiring the 32X's CPU subtype.