I prised the top part of the center panel out, but the clock was still stuck. I got fed up, and my thumb had dents in it from pushing the lever so hard, so I grabbed a screwdriver, placed it against the lever, leaned into it with great force, and BANG! The clock shot out about 30cm from the dash, didn't even break the lever. The wiring connector remained in the dash.

It was a bit of a challenge to cut the back of the slot out, to fit the obc. I used a hacksaw blade and did it in place. All I had to do then was power up pin 17, and it burst into life. Of course as soon as I start the car, I get the -37C temp warning, but I'll live with that until I get an outside temp sensor.