IMHO, I agree with the S/H suggestions... B/c those roots are tailor-made to the water-culture environment, repotting into a bark/bark mix, (will be
VERY dry, in comparison to water culture) it would probably just dehydrate the roots. Unless you want to pot into moss... That would probably work well for this one too (assuming you can get the watering right, which admittedly, I struggle with a little myself
)
If u
must do bark, I would suggest boiling it in RO or Distilled water first... I've heard that this opens the pores in the bark, so it will hold more moisture (the same way older bark media would, *just watch your watering). But, I'm not sure how long u would boil it... 30min? No idea about this... Sorry
...S/H would probably be best, and, with S/H you basically can't over-water... So if overwatering was the reason for the rot in the first place, this would be good for u
Good Luck! And let us know what u decide to do... We are a curious bunch, & like to see all the various ways ppl grow their orchids