Yes, it is. I've done it many times. In fact, I just did it with a Laelia anceps that I had mounted on teakwood. I soaked until the majority of the roots were pliable, trimmed what was stuck to the mount, and potted it up.
Having said that, is the mount in such a way that you can actually stick it in a pot and cover it up with medium? That's also another alternative if the roots have taken too much hold.