This could be fish-tank case ...... or similar ..... such as having the plants inside a humidity tank, with a little bit of ventilation, and keeping the temperature nice and warm (but not so warm as to harm the plants). And put lots of wet sphagnum pots inside the tank. The plants can just stay bare-root in the tank ...... actually no-root .... since there are not much or no roots left on them at the moment.
Provide medium light levels (no direct sun etc). And can then see if the orchids will start growing new roots.
I agree about cutting off all the flower spikes. And allow the orchids to try sprout new roots.
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