Thank you everyone, for your insights
@isurus79 - I have seen marked improvement since implementing your suggestion; several tiny new roots are attempting to grow, and the ones that had been growing straight up are now curving back along the plant, towards the damp sphagnum.
The back bulbs are so badly withered at this point, I am nervous as to whether they may be lost, and how well this plant will recover for next year. I have heard they are pretty resilient, so fingers crossed that next year will be a new year, with no mistakes in it....