give NPCs access to a generic conversation

[hardarg]

Hey there, I'm trying to build a mod that sets up alot of vanilla NPCs to have access to a generic conversation. This is how I've done so far:

 

(1) Edited DLG files of NPCs to add new dialog branches, (2) which plays a cutscene at the end of the conversation and (3) automatically initiates my custom DLG.

 

Unfortunately, I can never seem to make (3) work, how would I go about doing this?