While ey are understood as a leader, I never really thought of em as being that important. It's been a while since I did my study of Enoch, but Busasajel* doesn't even figure into any of my notes with the exception of mentioning the verse with the leaders. I'm not sure how much corruption of information there is between him and Bezalel (BTzLEL) who is a different figure. What sources did you have on em anyways? I don't see a direct reference to eir punishment, which means ey still might be easily reached, even them Shem and Atz are still able to communicate, it's just a bit more work. If you're looking for hard sources, if I know where you got your info I could at least cross-reference that. If you're looking for soft sources (which I shun with the wilful exclusion of hard sources) then I'd say try contacting em. By their nature the Bene are easy to at least connect to, not all seem to be able to, or want to talk, but tracking them down isn't a chore.
*Busasajel is the translation I prefer, until a more complete version of the name appears in a language I can at least transliterate. I haven't seen complete Aramaic of the name, so I can't even try to looking in the dictionary for meaning. I can't find a source that gives the Bezaliel translation, just ones that say "It can also be this" but don't explain why.
When we first begin all things simply are.
As we grow all things are external.
As we learn all things are internal.
As we understand all things are not.