I tried
<lemma=WIVU/he/??נ> for my BHS SESB 2 also tried with asterisks and reversed the ordering of the nun and the asterisks so I switched to BHW and tried same variations starting with: (just to get the peh-nun lemmas)
<lemma=lls/he/נ**>
I also tried typing: h:n*@vn in the builder (i.e. Hebrew word starts with nun, is a verb, in nifal...
Also played with morph document a bit, but it won't allow me to enter wildcards for the lemma
Appreciate the help,
-Jeremiah