Dear Erica,
My go-to-reference for many of our DBA modules is the 2018 book by Costly and Fulton (see below). Are you familiar with it?
Costley, C., & Fulton, J. (2018). Methodologies for Practice Research: Approaches for Professional Doctorates. SAGE.
Otherwise, a traditional PhD org theory syllabus may be a good starting point, but probably requires tweaking/refinement for the practice aspect/background of DBAs.
I'd be curious to take a look/exchange once you have a draft.
KR, David