HELP needed with a rescue (and with a rough ID)

[Orchid Whisperer]

A co-worker's husband told me about an orchid that he had that was struggling (one of several plants given to him by a friend). I agreed to have a look at it, see if I could help.

First off, what is it? Here's a couple pictures:



From the plant morphology, I am thinking some type of Dendrobium. Longest cane is roughly 6 inches (15 cm), longest leaf roughly 4 inches (10 cm), widest cane about 0.5 cm (0.2 inches) near the top, narrower toward the base. There is no indication that this plant has bloomed any time recently.

I know a species determination is not possible, any idea what category to place it in for cultural purposes?

OK, on to cultural concerns. First thing I plan to change, it appears seriously over-potted. I will re-pot into a much smaller pot, as soon as I have a recommendation for new potting medium. Right now, it is mostly in fine hard charcoal, with some fir bark and a little perlite; bark does not seem decomposed at all. Should I stick with any/all of these in the medium? Or switch to something else?

There are very few live roots right now. Here are the only ones I see:



close-ups:





I have some Dyna-gro KLN, would a periodic soak (say, for 15 minutes every couple of weeks) be helpful for getting the few existing roots to grow? Other suggestions?

Finally, one of the newer growths has some leaf issues, which I think look fungal:



I was planning to clip off the affected leaves a cm or so below the diseased tissue, allow to heal, treat periodically with Neem as a first line fungicide, switch to something like Cleary's if needed.

Any other cultural suggestions (watering, rest periods, etc) would be appreciated. Thanks!