Charcoal is added to help a potting medium retain water, but the orchid roots don't want to be drowned or suffocated by our medium - so thats what the bark does - it provides space and air around the roots, and does not retain too much water. The main thing with your potting medium is to not over compact it around the root, as it needs the air.
As for the aerial roots, for sure they do not want to be buried beneath the medium, nor removed, as this is where your orchid is getting its life support! I like to think that when there are a lot of aerial roots, one can see it as a sign that your orchid does not like its potting medium. Maybe looking at your orchid with its single medium root, this may be a sure sign it did not like its previous potting medium!
You do not want to repot the orchid into a bigger pot as general advice is the medium roots like to be crowded. If you find your aerial roots unsightly, you may find placing (nesting) your smaller pot into a larger decorative pot an option. Hope this helps