I think it depends on the texture of your mount as well. I removed an orchid from a rather flat and even surfaced mount (compressed cork), that was way too small and not that pretty. It wasn't easy, but it was do-able. I soaked it for a while (at least 30min I would say), and then with a knife tip I ever so gently pried the roots off, a very little bit at a time. I got away with minor damage, but I don't think I will try it again. This orchid had somewhat thick roots, I don't know if I would have managed as well with thinner roots.
For highly textured mounts, like bark with many cracks, it's virtually impossible to remove the roots without significant damage.
When at all possible it's better to attach the old mount onto a larger one, and let the plant spread onto it.
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Camille
Completely orchid obsessed and loving every minute of it....
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