Got it out! Dropping the steering column was the key to finding that elusive clit. Here's a picture of its location at about the 4 O'Clock position from the steering column, with 12 at TCD. The good news is that my pin was still movable, and responded to a few taps with a cut off 10p nail and hammer.
Now we'll install the new switch, etc. and see if this does the trick.

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