I don't think it'd work as an add-on.
Instead, I think you'd have "LIVE" worlds, in which all owners would show up at a specific time to play a live game against their next opponent. If someone didn't show up, WIS would act as normal against the live owner.
Conceivably, these worlds would have owners who all said they'd play live one or two times per three-game cycle for the entire season.
Other worlds would continue as is, without the live option.