I'd love to hear what method you use for playing solo. I'm sure that are plenty of solo gamers out there that would be grateful as well! 
I've tended to borrow ideas from 2HW's rules, particularly Rally Round the King.
I created army lists that had about 50% of the points spent on obligatory troop types and then the other 50% created by dice rolls. The lists also defined what type they were (mainly cavalry, mainly defensive, etc).
The board was divided into nine sections and the scenery was laid out according to dice throws.
Troops were deployed depending on a dice throw compared to their type.
And from then on I found that the command rolls threw in enough uncertainty.
I'd be interested in learning more about your 'unconventional' methods.
