Unbreaking X is simple enough. It isn't as if it's hard to implement that.
-9000 this is a bad idea. The solution needs to be make the Parkour to get back to the top way way easier so you can just get a new kit!
~ @iMeepCraft.
On the topic of the parkour, the reason that this wouldn't work is because of people shooting you down, and/or camping the top of the parkour. If the parkour is much easier than how it is right now, then people could just wait up there, reclick the kit, get healed, then go back down. That means that they can buy extra potions, soups, get a free heal by the kit reset, and then go down. It would be too easy to get a buff if the parkour was easier.
With Unbreaking X, that would mean that there isn't really any buff to the strong kits, besides prolonging how long your armor lasts. This is especially helpful for bow classes and the citizen kits, where the majority of the classes don't have any Unbreaking enchants at all.