Excellent news on the Epidendrum.
I have a feeling the chances of the miltonia rooting is slim. They don't have the same growing habit as an Epidendrum and we don't usually take cuttings. They usually send roots from the base of the plant and I can only imagine it surviving if it sends a new growth out. But you can try by diping the base in rooting hormone. Next time I suggest that you take a division instead, you will get a blooming sized plant faster.
I think the other orchid is a dendrobium. If it is a dendrobium, when you pot the elongated pseudobulb in a pot it may send out new plantlets or keikis from the side(the meristematic tissue is where the blooms usually form or where the old leaves attached to the cane). I think this one will more likely survive than the miltonia. Plant it in sphag moss so that the meristematic tissue touches it and you will get new keikis.
I am unsure of what happened to the phal. It sounds like to me that the plant got dried and was stress out from the extra light. Usually we slowly increase light levels