One could try to "hack" CI and RI. One global CI seems unrealistic, what about CI per country? That'd allow for a "home bonus", if you are based in for example Germany, you'd get a CI bonus in Germany.
Then, you could further enhance it by giving you a CI regarding different route types, for example say, you are known to have long haul routes, so your LH-CI is high. Now, if you open up some SH-route, you have to manage with a lower CI (until it rises because you become known).
So, everyone can do everything, but if you focus yourself into one area of business, you can live with lower marketing cost etc.