Poor jastaV, his threads are always moved here and there
I have found this letter from Napoleon to Davout, 2 of march 1813. My french is noexistant, so I am not sure, but here seems to be the instrucions to form the force you talk about from units of the I and II corps, but giving free hand to Davout about the specific elements and generals. If you have the OOB of both corps you can pick as Davout did?
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The next letter to Davout is dated early june, congratulating Vandamme for taking Hambourg. I will try to check Davout and Beauharnais correspondence to see what I get