PS I have just re-read your reply and your situation sounds a bit more urgent than mine.
On my car (and I think yours) the pin plunger has a little rubber bellows, if you can find that inside the wing with your fingers you will find the pull tab at the far end of it. If you have not yet rmoved the full side panel perhaps a thin hooked tool might find it, but you could tear the bellows.
I have looked on Ebay and can find only one version of this lock with a bellows, part number 9170198; I'll know better when I get it off but it "feels" like this one.
