The biggest problem I see is that the campaign keys are used for both the master and the regular version. For doing the master version, you get more currency than it takes to make a key, if we count both chests. However, using the keys for the normal version is just not worth it at all, assuming you are able to do the…
Tooltip does indeed show nothing. Stats are applied though, and when trying to apply the same kit again, error is shown that the gear already has this modification.