The way most of the normal instancing works on live is that they will have an NPC you talk to to get the instance, then a door or NPC (just need something else scriptable) that will send you there.
So for the example with unrest. You could have the normal version of unrest then plop an NPC near the zone line that you can request an instanced version for which could have different NPCs or a quest associated with it. (More just throwing out alternatives to having to zone twice)
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