There is a quest::setguild(guild_id,rank) function. Set the task to function off of a script when completed. Make sure no members of the guild are officers/leader so therefore there can be no invites. Setting up the instances would be easy enough with Akkadius' plugin. Just use different versions to set up each.
The easiest way to prevent people from doing as you said, quitting and joining with another would probably be to set it up how you suggested. To join a guild by task, making it non repeatable and setting a qglobal in conjunction with the char id marking that character to which guild he belongs to. That way if they ever decide to leave the guild and attempt to get the task again, it checks the qglobal for that toon and then puts that toon back in the guild they belong.
This is just how I would personally set it up. The idea is completely doable.
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