How about if you could get a permanent sleeve stripe after wearing a KOM jersey? E.g. a small blue poka-dot stripe for the Epic KOM jersey, etc.
It would need to be restricted to KOMS gained in active worlds I guess?
It would add an extra motivation to going for a KOM (rather than the current situation where you usually get to wear the jersey for 10 minutes if you’re lucky (and usually in too exhausted a state to appreciate it.. ;-)).