With the Credit Heist as a weekly event I think it'll be great to add another weekly event. Every week you could do an event that gives pieces of either MK 3 Stun Cuffs, MK 5 Stun Guns, Tenacity Disks, or MK 5 Detonators. (For Example: one week could be dedicated to rewarding cuffs and next week could be stun guns.)
Players get three or five attempts and can refresh for 50 crystals (increases by 50 per refresh). This might benefit both sides, players can get their 50 piece gear faster and lessen the burden of farming items that most characters need, and players might be willing to spend crystals for refreshing the attempts.