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Radioactive
Here is my slightly-less thought through reply. Let me know what you think.
(SuperPools are what I am referring to on the OP. Single solution Pool with a P/C switch)
1. Can be done with SuperPools even if it is only for 2 posts. P/C switch is active.
2. You can hide from the index with a SsperPool, but you can still be seen in the Pool section.
2a. Unique naming of the pool should warn the viewer.
2b. As 1
2c. Retired.
3. P/C switch is inactive on the SuperPool.
Your final semi-issue could be resolved with a 'completed' switch for the Pool. Your viewers will know when it is ready for download.
Negatives:
I can see a problem with unique names for the Pools.
Legacy Pools & P/Cs - How would you deal with them?
It will be harder for the general users.