RebelMike wrote The Campaign is broken down into mini adventures.

-Like it.

The first one may be a quest for a powerful sword (that can be used by a general and does something), the second may be to secure a Gold Mine (get a treasure chest that allows you to Summon mercenaires or Buy off enemy units)

I really like this part.  Buying off enemy units, that seems rare in  tabletop wargaming and would be dastardly!

or Hard copy and then sell adventure packs with the items inside to be painted and used with teh characters.

This is the best idea of all.  Seems like the last wargame that I could purchase adventure packs for was AD&D Battlesystem.