Yeah, just tested and you can just disable DM, buy the mannequins and enable DM again.
You get a warning when loading the save game after you disable DM, but it should be ok.
(just in-case, might be a good idea to not be in an area where there are merchants)
EDIT:
http://skyrim.nexusmods.com/downloads/file.php?id=10589
Quote:
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This mod turns every living thing into mudcrabs. It's like Planet of the apes, but with mudcrabs!
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