You are correct about each potting medium. All three are ready to be repotted at the next proper time. I would repot them into whatever medium you wish to use. But read on.
With the Cattleya wait until it is making new roots, and they are just one or two millimeters long. Use a pot with enough extra space for two or three new growths. Bark chips the same size as those are fine. Remove it from the pot, shake off what old bark comes easily and don't cut off roots. Don't be meticulous about removing old medium or you will damage roots. Put it into the new pot with the oldest part against the edge, and fill in your new medium. Be sure the horizontal stem, called the rhizome, is at the surface, not buried. Stake the plant so it can't wobble, or use a rhizome clip.
Oncidiums need to stay moist. It probably came from a grower in a very wet part of Hawaii, so they used large bark because it rains so often. In a home an Oncidium in large bark should be watered every day or two. Repot when new growths begin, because new roots will form soon after that. Many people use small to fine bark for these. Again, use a new pot big enough for 2-3 new growths. Shake off the old medium but do not be meticulous about removing it. You don't want to damage the fine roots any more than necessary. Repot at the same level, with the oldest part against one edge.
The Phalaenopsis is in very old, broken down moss. I would repot as soon as you can get the materials. Phals. can be repotted at any time. You could use medium to large bark, or new sphagnum moss, depending on how often you wish to repot. Use the smallest pot into which you can wind the roots. Unpot the plant, put it into a bowl of water and gently tease out the old moss. If using bark, twist the roots into the pot, and backfill with new bark. Have the bottom leaves at the bark surface.
If using moss, get it damp, then squeese out as much water as you can. Holding it in one hand, put some moss between the roots and wind them around it. Wrap more moss around the roots until you have a largish ball. Wedge it tightly into the pot. If it isn't very tight, take it out and wrap more moss around the roots. It should be so tightly potted you can pick it up by the plant and not have the pot fall off.
Water new bark every few days. Watering in moss is different. Never soak Phals. in moss. Let the top get crisp dry. Run water over the top for only one second. It will diffuse through the moss, leaving it just moist but well aerated.
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