Another method that may work for you is to put the car into gear while not running, then start the car. This should be done only with clearance ahead or behind the car. Usually as soon as you bump the starter the clutch will pop free.

It seems the clutch sticks enough to make it hard to put the car into gear while running, but not enough to actually drive the car if already in gear.

So, if you have free space in front of or behind the car, you won't need someone to help you with this method. Just be prepared to turn off the key switch to stop the car if the clutch doesn't pop loose.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles