(1st drain it as best you can)
Instead Push/Pull the old 134Lube out by Hand Turning the compressor and
feeding it the new oil UNTIL all the old lube is gone.
[using flush in the Compressor will destroy it]

on to Question # 2:

"Also, is it possible to pull the evap out of the blower motor like this shown on a 190E 2.6?"

Hoo Boy Don't we all wish it were so!

The whole dash has to come out of the car 1st...

Some helpful tutorials:
http://www.peachparts.com/shopforum/showthread.php?p=1122635

http://www.peachparts.com/shopforum/showthread.php?t=121523

http://www.w124performance.com/images/W124_dash/

http://www.peachparts.com/shopforum/showthread.php?p=197605

AND

http://www.peachparts.com/shopforum/showthread.php?t=226049&highlight=W124+evaporator

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'84 300SD sold
124.128