...especially if you've already had it to an electrician.

But has anyone checked for a good +12V at the coil (blue wire) while cranking?

Since the FI is working, it must be getting timing pulses from the EZK. Based on those pulses, the EZK Power Stage should also be triggering the coil. Was PStage terminal 5 checked while cranking?
(I think maybe using an AC setting on the DVM?)

Here's the long shot. The later turbos get the coil +12V from the RSRelay (which gets picked by the Fuel relay). But the only diagram I found so far (a Mitchell online) shows that the '89 turbo coil is powered from Fuse 13?!?.

A fused coil? That's new to me.

Put a 12V test light (not a DVM) on that blue wire coil terminal. If there's no light while cranking, there will be no spark. Meaning fuse 13 is on the suspect list.

If there is a good light, it should blink or go dim when cranking. A steady light would suggest the coil isn't being tickled buy the Power Stage.

EDIT: The online Mitchell shows fuse 13 just being used as a common terminal having:
A blue wire to coil
A blue wire to power stage
AND a blue wire to (from?) the FI ECU terminal 18???

But the Mitchell Turbo ECU diagram shows a blue wire from 18 to the coil???

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.