I did several cycles of the Chardok bank and it seems to me like a viable camp for factioned bards with reasonable gear. I noticed that the wiki marked a Treasury Guard and a Slaveblock Guard as level 51. It's correct that they are bard charmable! I recorded breaking the camp:
https://www.youtube.com/watch?v=LJeCscdNNhk (just gameplay without narration). The most interesting part imo is the Auditor ph pull at about 4:30. I lull the banker, then charm the Treasury Guard. The other guards don't add because the PH is only social aggroed, and the Treasury Guard is charmed by a factioned player.