. . . and allows other DuoHackers to find far less expensive/READILY AVAILABLE, cache-on-board 603ev ProcCards from the 1400 series to speedbump their 2300s . . .
. . . instead of the CrescendoPB! }
I'm not yet convinced that Sonnet's cable won't work, it looks like a straight passthru cable to me (that fits!) with some intervening circuitry that likely allows 2 PDS cards to be addressed in one PDS Slot.
It's probably very similar to that super-expensive SE/30 multicard adapter with the mysterious PAL on board. Disable that kinda nonsense and I'll bet the Sonnet Card will run just fine on the end of its matching cable!
If this doesn't work out, I'll just have to do ONE adapter card that's a lot more complex a task than doing two simpler cards for the ends of the existing/available Sonnet cable . . .