I think they have something like this on Homecoming, but when you have reached a certain level, there’s an optional contact that grants mayhem missions. Either that or make it possible to gain credit for brokers and do their mission outside the level cap.
I think the contact on homecoming needs to be unlocked by killing a set number of heroes.
I think some sort of badge or requirement over just being 50 would be good to have.
Though it might be easier/smoother to add them to the Ouro mission list which would work as well imo.
I’m assuming too that the missions would set you to an appropriate level.