OK: The solution? Spark plugs!
I had systematically worked back through the fuel system until I isolated the electronics as a problem. Disconnecting the two sensors on the throttle body made the motorcycle run again, connecting them and the stalling came back. I thought it was coincidental that two sensors would stop working at the same time but before I got the voltmeter out to check the visually good wiring loom back to the ECU I wanted to rule out the spark plugs I'd recently replaced. I put the old ones back in (which I always keep just in case) and bingo!
So the NGK Iridium DR8EIX spark plug is the culprit. The old stock D8EA's work just fine.
Now I've just got to make good all the work... exposed wiring loom and bike in bits. I'm just grateful the problem is a $15 part and not a $400 part
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