In addition to what KOOG has said, i just want to add..
The fungus growth seems to have mainly been on the dead petioles, which were dead, and you expect those to attract fungus. So there was nothing really wrong with the plant itself. The roots aren't that bad, there are some nice plump green ones and some nice plump white ones there. No growing roots, which suggests the plant was kept a little dry, and possibly not enough light. But good culture and time should get those new roots growing again.
The orange spots are just another type of fungus, not spider mites, so no need to worry about them now that you've peeled off the petioles.
I would not mount this plant, because mounting is a very drying method of culture, and you need either constant high humidity or daily watering for it to really work. There's nothing to be gained from mounting that you wouldn't get from pot culture with this plant, so it's just a matter of your own choice, whichever method you prefer. Plus, its only got two healthy leaves, so drastically changing the culture method probably isn't something i'd recommend.
I don't like bark/sphagnum mixes. The tannins from the bark tend to degrade the sphag quicker, and the acidic conditions of the sphag in turn degrades the bark. If you do a mix with sphagnum, try something inert, like chunks of styrofoam, perlite, or clay balls.
Apart from the fungal growth on the dead petioles (which is now fixed), and the general lack of root/leaf growth, i don't think the plant really needs a radical change in the media. I would go back to the sphagnum or a sphagnum/inert mix that it is used to. Drastically or regularly changing the type of media will do a lot more damage than just sticking with one and letting it adapt.
And move it to a position where it gets better light if you can.
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