Sorry, I missed your edit.If you made the period 867-936 fully scrollable, that means you also touched upon Africa, the Middle-East and Europe correct?
Nope, as I said in the OP, I'm only interested in working on Far East. The rest of the map I left completely untouched.
The game will generate fictional rulers to fill the gaps, and if I recall correctly all top level titles have already full roster, so it shouldn't be too immersion breaking.