I went with Seelah, Lann, Ember, Arueshalae, Sosiel and a 2H dps paladin. All of them single-class, except for my failed Ember-Loremaster attempt mentioned above. So not complicated to build.
Anyone but Seelah could be swapped out for companion questing.
I took the Enduring Spells and Greater Enduring Spells mythic abilities as soon as possible for my buffing characters. With most buffs then lasting 24 hours, there’s a lot less micro-management needed.
Both my paladins got mounts, but I could easily have not done that. However, the horses do surprisingly good damage and are two more melee characters that can have the fantastic Outflank talent. I seldom use them as mounts - I prefer to have them running around hitting back rank enemies.