Amazing follower tweaks is a bit too complex for me, I prefer the vanilla follower system. But you did give me an idea w/ multiple followers, which kind of works! Used Multiple Followers lite - Followers were still sent away on entering the Ancestor Glade, but could be re-recruited and then they'd follow. Serana still complains about followers being present when going to Castle Volkihar, but same thing works at least on the Dawnguard faction quest - dismiss follower, speak to Serana, re-recruit. Haven't yet tested to see if they turn up in Castle Volkihar yet, nor what happens with the Forgotten Vale, but will see what turns up. Not exactly what I was looking for, but it's a workaround I can live with. Thank you!