You cannot bypass this step. You must be able to talk to Reania, and I remember this part of the epic being the hardest part for me. Bloodsabers weren't my biggest problem, Opal Dark Briar faction was (often tied to Bloodsabers, incidentally). I had done all the Qeynos Investigator quests and camped Pyzjn obsessively in my teens.
I'm going to try to recall all of the steps I took to undo my bad faction with Bloodsabers and Opal Dark Briar, but I do recall handing Guard Shilster loads of coin.
http://wiki.project1999.com/Guard_Shilster
He's in NK near the NE edge of the zone. I see we may need to update this on the Wiki page, as the Black Burrow Stout quest isn't there. Maybe it entered the game at a later date? It would be helpful to future enchanters to know about this guy if the quest is there.
I also remember killing Neclo Rheslar (in QH at the guard house near the WK zone) and some other NPCs repeatedly to raise this faction. (Camped the 2 NPCs in front of the Freeport casters' guild for awhile). It will quickly make you KOS in Qeynos and the FP caster's guild, but this helped a bit too. But, I rationalized I didn't "need" access to these areas, and I had more than enough options to fix the faction later.