Xume vs Kase magnetic filters

[mirekti]

Is there anyone here using Kase magnetic filters? I have tried Xume, but they add too much thickness, especially when stacked.

If I received the correct info, with Kase I’d be able to attach their ND filter directly to their step up ring, and it would be really thin in profile. My understanding is Xume uses adapter ring for lens and adapter ring for filter, Kase on the other hand (if I got this right) only has lens adapter ring, and their filters have a built in ring.

The problem with Kase is what if I wanted to add a diopter in front of it. I am not able to find if there’s an adapter ring that could be screwed on the existing filter, non Kase one. 
Any thoughts on how to adapt non Kase filter to Kase Wolverine round filter system?