You'd simply have two Undaunted mercenaries to act as whatever roles you aren't playing. Any mechanics requiring player interaction (like Scalecaller's Peak's required block, or the chain down execution from Fungal Grotto II) would require the player to act on the mechanic or lose the targeted NPC support. None of these would target the player if they're a lock-down move that kills so the player has time to learn the mechanic (at least, in most cases, March of Sacrifices final boss should prob target player each time). Not only would this allow players to engage in the lore of the dungeons doing it this way, they'd learn the mechanics in a more stress free environment. The Undaunted support could even shout out how to combat each mechanic. Naturally, the Undaunted dailies wouldn't apply to these, but you could clear the dungeon quest this way, and get blue gear at least.