I do not grow these but what I would do is to get a basket-type pot and, after removing the old medium and soaking the entire thing well (to get those roots from the new growth hydrated) put the lower bulbs inside the basket pot, gently fill to the root-line of the top growth with chunks of lava rock. You can top it with your favorite medium if you wish. Hang it where it gets a nice breeze and water well while it is growing. Wait until the new roots grow a little before fertilizing. If you can get your hands on the seaweed stuff that everyone says helps with roots, I would give that a try. The rock and basket pot will keep it open enough to prevent rot on those old, wrinkled bulbs. and the old bulbs should continue to give energy to the new, top growth until they are self-sustaining. It will take a while for it to recover enough to bloom.
Hopefully, someone who grows these will give you better advice. This is just how I would do it. I've done this before with a Maxillaria tenuifolia and the old bulbs under the lava rock are still sending up new shoots....
Good luck!
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