This Pocketmod things really seems to be working, and it seems to run a smooth game (I'd love to get some blind playtest feeback, but the local sessions seem to be working pretty well).
I'm thinking that at some stage I might revise the concept slightly and revisit the world of the goblin tarot.
The core rules would comprise a booklet, as would the scenarios (just like the system already established). Heroes would start with a basic booklet, they'd get a second booklet to describe the kinds of ways they can motivate the goblin hordes around them. The whole system would be modified from regular playing cards and would shift toward using the goblin tarot deck as the basis of it's play.
It would be interesting to see how mass combat might occur using this type of system.