Hmm... If you're desperate enough, you could you leave the key inside turned to ACC, lock the door with another key, use a cig lighter power inverter, and run the extension cord through the engine bay into the passenger compartment to plug it up at the cig lighter. Then, just get in, unplug the cord, start up, and go. Though, there's risk of draining your battery.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.