The pulley mark you made prior to having the transmission reworked would no longer work as the converter is now phased at some different teeth engaging on the input shaft meaning even if you removed the converter and then did the rotate slightly and wait for 3 bumps to seat technique - the converter will not be in phase with the engine anymore.

Bumping with the starter will spin it too fast and you may not be able to catch the drain, you will need to spin the engine very slowly to see the drain.

For some reason if you dont find it then you can do a cooler line flush, The cooler line is the exhaust port of the torque converter, use the transmissions own pump to do the job for you. I do that on nearly all cars with a painful drain procedure

infact my own E320 does not have it and the only way for a full ATF change is the cooler line drain out.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)