I suppose that you're, like me, not a Pu expert yet
What seems to be clear is that it is a difficult thing to add humidity, and that doing so inside an airtight container will probably have unfortunate consequences.
Of course you know the whole science about humidors, artificial climates and so on... I agonized about that in the past months too. I read a LOT and what I came up with is the following: There are a ton of different opinions, and no one really knows too well, because theres hardly anyone who stored PU in the west for decades. So some educated guesses, and some not-so-educated ones too.
What I'd suggest is the following: Don't let youself be irritated too much with all that technical stuff. Just buy a couple of teas and seal them up in airtight bags. They won't turn bad that way, and its not worth the fuzz if you don't plan on storing them for 10 or 20 years... in two years, they won't change dramatically anyways.
Then, drink, read on, and get some more experience. I for example don't have the means or the will now to create a collection... I just have a couple of cakes, which i drink, and enjoy and otherwise do other things with my time.
If you get hooked and start a full collection, a couple of years in an airtight bag won't have ruined your tea, it will be fine. So then you can plan a storage area and do all that fancy stuff. If you expose it to dry air, the tea might dry out and become unpleasant, and if you expose it to wet air, it might get moldy.
So why not seal them up for the time being, drink tea and see how much further you will want to take this?
P.S.: What you might add is a "waking up phase" - This is, like the whole storage question, partly a question of belief, but I'm convinced that especially the teas that have been sealed airtight should be go through that: It means to break up a portion of the leaves and store them for at least a couple of days, or better some weeks, in an non-airtight container before drinking. You can try if you notice an improvement, and decide for yourself if you think this helps the tea.