I would leave yours on the mount. The time to repot is with new roots forming, and that is unlikely now in the winter. I think if you grow it in a jar it will be fine on the mount. Just set the mount on the bottom of the jar leaning against one wall. Others here have put sticks across the top of the jar and hung the mount from the stick.
I would have left mine mounted if it arrived that way; it arrived bare-root, so I potted it in sphagnum moss in a tiny container over a bed of LECA that always has water. I punched drainage holes at the surface of the LECA so the moss does not remain without air. It took more than a year to begin growing again, probably because of the long journey. During this time it lost most of its leaves.
If you leave the jar open I would take it out and water every day. If you close the jar water when it begins to look less wet. From reading here on Orchid Board it doesn't need much air circulation.
If others have anything to add I'd like to hear from you.
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