Repotting vacuum-packed phalaenopsis
I recently purchased three healthy orchids from a local grocery store. They are potted in sphagnum moss that has been almost vacuum-packed in plastic with a hole in the bottom, and then placed inside decorative, hole-less ceramic pots. I already have orchid bark mix and aerated, unglazed terra cotta pots in which to repot them (I feel more comfortable using bark as I'm nervous about rot), but I am unsure of whether or not to do so since they are in full bloom and the roots down in the plastic look healthy and green from crown to tip (minus some nutrient staining). Should I water very sparingly and wait for the blossoms to fade before repotting, or should I get it out of there ASAP, as the plastic seems to keep them quite rootbound and tightly packed?
Also, I have noticed that several of the aerial roots (like the one pictured) have been broken in places but have remained connected by what looks to be a large vein--consequently keeping them silvery and plump. Should I just cut those off at the break point when repotting, or leave them be? Thanks so much for your help.