I just want to suggest making some kind of shrine to sacrifice items in exchange for very short amount of Playtime.
Sometimes alt accounts are not having subscription due to obvious reasons, but still there are situations when alt account got to be used in case of some emergency.
What if sacrificing a fate-based curiosity gave 20-60 minutes of playtime depending on the "class" of the curiosity?
For example, Edelweiss = 20 minutes, Bluebell = 40 minutes, Pearl = 60 minutes and so on.
As far as I can see it, this system can hardly be abused since it's based on fate, but people who have alternative accounts can make themselves a bit safer, having a few edels in storage for a rainy day.
Edit: Maybe there is some sense in making a restriction for sacrifice, like 5 per month, to avoid possible abuse and exploits.