It certainly should not be in soil.
However, in order to keep the flowers for as long as possible, rather than repotting immediately, I suggest that you barely moisten the soil when it is bone dry, and maybe even open it up a bit with a skewer.
As far as what to repot it in, that's going to depend to some degree on your conditions and habits. What other orchids do you grow successfully, and what medium are they in? Then, we can make an appropriate modification for the cordigera.
Ray Barkalow
firstrays.com
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