hi, glossterline -
i've potted a Phal while in bloom and depending on the medium and the 'age' of the flowers, you may lose them or preserve the longevity. it really all depends.
since you are transitioning from Sphag to bark, bear in mind you'll have to keep the plant more moist, as you are moving to a coarse mix. it would help if you gave it some humidity with a pebble tray beneath it. i suspect you may lose some flowers, but this is negligible compared to the overall well-being of the plant.
also, mind the light. after repotting my phals, i normally decrease the intensity of light they get until they acclimate to the new material (i usually do this for a week). i also make sure to monitor the mix to see that it never dries out during this phase. new root growth is almost immediately evident once i restore the plant to its normal light conditions.
best of luck - gorgeous blooms, btw.
