Oh, I do feel your anguish. if the rot is inhabiting both wood mount and plant, then the coming colder, darker winter weather is not going to help the plant. ( 6 months to spring!) If it was my plant, I would try the move, being careful to not ruin any good roots, giving a fresh mount, basket or pot. Orchids like 'fresh' media. You could try neem as a fungicide, as it is readily available and is said to be effective on fungi, and other microbes. (but check the bottle or other resources to be sure you agree with the choice.)
The plant will be in a holding pattern until March - April.
Anther method to try is to use all perlite in a pot to re-pot I've done this for back bulbs and had success in getting them to root.
Obviously, it's your choice what to do, but doing nothing might get more of the same results.
I wish you the very best of luck with your R. digbiyana
Keep us posted
Maryanne
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