Can't add a promo, as to do that from within the DLL would require hardcoding. I despise that, and will not do it where a different option is available.
I see... (But modules, like mekara's have promos that grant another promos that fade within a turn to lead to another promo).
Though, I have another request: Overcouncil have several heroes that add a vote, however, currently Undercouncil only has one hero that grant a vote (Gibbon Goetia). Could you make some already made heroes to provide a vote (More likely, Alazkan the assasin, rathus denmora, or anything related to or being alike the undercouncil)