We have MT keep Brand until FoU. Then OT takes it and still does dps standing to the side. We tank swap during Flames of Rebirth. I suppose we could tank swap during either Flames cast, but this worked. The only issue is OT not attacking during the Fountain, but it's not a big deal.

Now I need to remove Defiance after I get out of Fountain. I won't need it until we swap, even with Brand hitting me as OT.

Also, I found Warriors make Revelation last phase easy mode. Vengeance + ToB + IB and SP for all of them in which War is MT.