I haven't really looked at this stuff in a while (not since the movie
"Fallen" came out, which, BTW, is kind of a lame movie IMO). But I think
the Azazel in Enoch probably represents a tradition that understands it
in Leviticus as some sort of a wilderness spirit. As you say, the
parallel structure tends to favor this reading. On the whole, I think
it's certainly a viable option.