How about with a side count of 7s?
Add the 7 side count to the RC to place your bets according to KO (make sure you customize KO for an IRC of 0) and then make your plays according to the Hi-Lo indices.
Of course, you're probably better off just using Hi-Lo and spending your effort on an Ace side count instead, but it would be interesting to see some sims for this "Hi-Ko" count. And if you sidecounted Aces as well, I bet this system would outperform both KO and Hi-Lo. Although, with the amount of effort required, you may as well go to a level 2 count.