Looks good imo!
Keep in mind that starting as Pally and getting the Hag hair will break your oath (as many other things in a Durge run). This could be useful with the ability to control undead in Act 2 but will prevent you from doing respecs if needed and paying the OB knight just to respec is expensive. If this is not an issue for you I'd say go ahead.
May I ask what build are you planning for Astarion? I always want to have him as a companion in Durge runs but I feel that him being a Rouge means that he and I will end up filling the same role.
