Is there any hope left for my wrinkled, rootless Catt?

[camille1585]

I've had this Noid Catt aclandiae hybrid for probably close to 10 years (see user photo above) that I was growing in a weird water culture type set up which started as an accident (put the pot in the vase to keep it stable). Basically I water by pouring water through the pot and it partially fills the vase. It worked well for many years, until I noticed after my 3 week vacation in August that the plant wasn't doing too great (very wrinkled), and to my horror I discovered that all the roots had turned black and rotted.

What can I do to try to save it? It is nearly rootless at this point. It's just a noid, but I've had it for many years and it has a lot of sentimental value...

I am a Phal person and only have 3 Catts, so don't have any experience reviving them.