Fw190D-9 with rare letter markings

[Schlageter]

Hello all,

I was wondering about the identity of this Fw190D-9 with rare letter markings. The picture from JaPo's Focke-Wulf Fw 190 D Camouflage & markings Part I shows unfortunately only an incomplete code, xx + WE.
From the caption I can gather that this aircraft was most probable neither assigned to a test facility nor are the letters (in blue or red) part of a Stammkennzeichen! The only Dora with letter markings I am aware of is T6 + AA from Stab/SG 2, albeit this is known only from a Flugbuch entry!
From the camouflage of the pictured Dora I would say it stemmed from the Weserflug or Mimetall production.

So my question is, if there are any units known which were in 1945 (partially) equipped with Fw190s and using letter codes?

Thanks in advance for any input or thoughts!

Best

Michael