I would not repot until the next time it makes roots with new growth. I would pot deeper in the pot so the newest roots are below the surface. Some Brassias climb as they grow; the oldest pseudobulbs may be deeper to ensure the new growth is at an appropriate depth.
I don't think mixing sphagnum with bark is a good idea. Others disagree. It can obliterate air spaces needed by the roots. That said, happy Brassias in good growing conditions use so much water they often do well in 100% sphagnum soaked at each watering.
I wonder whether your plant's roots were rotten. That is pretty rare for Brassias. I don't cut off roots even if I think they're dead.
What are your growing conditions? Temperatures? Humidity? Do you know whether your plant is a warm/hot grower, intermediate/warm or cool/intermediate?
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