Sure - I read the question about what's a possibility, not what's practical. Of course, PCs being PCs...
Yes, but they use basically the same methodology as Argrath does in his LBQ later when freeing Sheng Seleris. The HQ may need more oomph than the one in S:KoH provides, but it's clearly pointing in the right direction when it comes to getting someone out of a Lunar hell, or other resurrection-blocking stuff.