So, I am kinda annoyed at being unable to use, say, Empire Engineers without a corresponding DLC, but I can not buy the DLC (for now), and, obviously, I do not want to do anything unsavory.

Is there a guide to creation of, say a Copy of Captain, but with Engineer's army assist ability and recruited from gunpowder building?

Sadly, I was not able to find one such guide, maybe I was looking in wrong places?