You've actually stumbled on a great conundrum.

Well actually you haven't.

The window motor can be removed from the regulator while still in the car. In fact, if the motor is dead with the window up. You will have to remove it first in order to even remotely have a chance to get it out.

There is actually enough room to get a shallow 10mm socket and a small wrench (we are talking 1/4" drive size) in there.

Without removing the motor you would have to overcome the leverage of the regulator and overcome the motor (which even when operational is designed to resist moving without power applied).

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.