| I think your chances for survival are good but you'll need a bit of patience. It is difficult to give cultural advice now knowing what species you have. Coelogyne come from many different climates and range from cold to warm growing. But for the time being I think you are safe providing intermediate temperatures, medium light, and keeping it a little on the moist side. Perhaps not as moist as a Paph. I don't know what kind of moss you're thinking of using. I have one Coel cristata in sphagnum moss and it is growing well. The rest of my Coelogyne (about 25 different species and a copule of hybrids) are potted in various bark mixes.
One thing about Coel though is that they often resent beign disturbed. I basically never repot them, I only pot up (move to a larger pot not changing the mix) when absolutely necessary. After beign divided or repotted, they will sulk for quite some time. I have a Coel bilamellata that was divided in April, still not so much as a new shoot or root and the half-mature growths it had have stopped growing. I bought a pure white cristata division about a year ago, it has just started to grow. Also about a year ago I bought a Coel ocracea that was posted to me bare root. I potted it up and it proceded to regress (bulbs shriveling, leaves dying, no growth) for about a year until just about 2 weeks ago when I noticed new growths coming. So once you pot them up be patient. If you have high enough humidity, you could mount them too, or even better, grow them in a hanging basket as many of them have nice pendant inflorescences.
Regarding the habit of their root growth, most of the Coel I know will start a new growth then after it is well underway, new roots will begin to emerge from that growth.
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