You could despawn him when you have the group setup, like you do now but only have him respawn when the npc that flags everyone tells him to respawn. And if you have the only way in to the zone limited to that NPC, you essentially lock everyone else out. Say your flagging NPC has to be told "Ready" or "Return" or something when everyone is done, then you zone everyone in the group and then respawn the quest npc. At least that's an approach you could take. There are likely others...
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