First, please quit changing the medium it's growing in. Choose one, and stick with it. Each time you change how you're growing it, it weakens the root structure. Roots grown in bark, roots grown in sphag, roots grown in semi-hydro, now back to bark... not good, especially on an ailing plant.
Were it mine, I'd get those rotten leaves peeled off of it, and see if the bottom of the crown is rotted. If it is, there's not a whole lot of hope. It looks like you might have two viable leaves, unless the base of them is also rotted?
Does it have viable roots at all? If not, I'd be doing some sort of sphag and bag method on it. Put in a glass or plastic "something" and cover most of top of the vessel? A cloche? When it gets some viable roots, choose a medium and stick with it.
Please don't take this as being harsh... I just don't know how else to put it.
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