I find that unlikely, as Shamshel exploded in a burst of red goo after its defeat.
But the tentacles were still left!
But I think that it's way more likely that things like the Wunder
and the mechanical angels fought throughout Q are the ultimately result of the Marduk project. - i.e., what they were doing in Bethany base.
You know, that project which Gendo wanted to slow down so much, thus having Kaji blow the Place up? How about he didn't want SEELE having their playthings ready before he had his own awakened EVA?
There were mentions of the 3rd Angel getting mechanical addons, some of them entry-plug-like.
The Wunder looks somewhat like the 3rd Angel with those ribs, and the bridge has an entry-plug-like structure and tubes labeled "LCL".
Also, a line from when the SEELE-controlled MK-9 attacks them/tries to hack them ("The Wunder's original master!") implies that it was something SEELE had built, like the mechanical angels...
Misato & co probably just stole it in some action involving tons of badass gunfighting and panicky Kitakami getting told to use her gun by Maya of all people and all original bridge-bunnies kicking unexpected amounts of ass.