How did the roots look after they were soaked? Were any green and firm?
If yes, remove the ones that were not and pot the orchid up in a large chunk medium, with everything but the roots above the medium (this helps prevent fungus issues with new growth).
If no, remove the dead roots and stake very firmly on top of a large chunk medium and then place it where it won't be moved for a time. A new growth should put out new roots and the roots will grow down into the medium.
One of the reasons I like red lava rock is, when I have bought yet another rootless Cattleya and have it staked on top of the medium, I can water the rock like crazy to help provide extra humidity for the orchid without worrying about the rock decomposing.
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I decorate in green!
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