The point isn't to take them out of circulation forever, just make it a really annoying pain in the ass to undo whatever we do them. Both for petty spite and also to make them spend more time on clean up.The NeverNever has paths that reach the moon.
Allegedly to reach the Gatekeeper's domain, you have to walk across the moon by WoJ. And I doubt Rashid would appreciate us littering the paths to his territory with high-grade magical waste.
If Hades would take them I'd hand them off. But I have my doubts he'd take them either. Or be allowed to hold them.
It all depends on the rules under which the Fallen are allowed to operate on Earth.
It may be a balance thing from when Christ walked out of death in Dresdenverse mythology; Christ died and walked, and so thirty Fallen were permitted to leave Hell under very strict conditions.
If there's a magically enforced contract in play, there's no point trying to move them offworld; they'll just get teleported back somewhere a human or someone who qualifies as mortal can pick them up.
Else the logical thing would be to stick each coin in a block of warded metal and concrete, fly an hour or so off the US west coast and drop it into the abyssal depths of the Pacific. Bonus points if you drop it into one of the deep sea trenches.
You cant tell me the Catholic Church hasnt tried deep sixing at least one coin before only to have it turn up again.
Rashid probably doesn't own the whole moon, so for something like that I imagine we could kind some really out of the way place that makes it a nontrivial effort to organize their retrieval.
The balance of power is a concern, but I'm banking on the idea that as a formally unaligned mortal we can do what we like without technically counting as a violation from either side.
On how the rules for this work specifically, my impression is that the coins operate on one ring rules. They can lean on things, but almost all their power is contingent on getting a person to interact with them first. I'd wager that the church has tried burial at sea, but the fallen either interfere as a group or the coin(s) in question lean really hard on the people trying and escape.
Fortunately for us, we can't be possessed and can ignore mental influences at will. If we put them in a box and take a cirrus skiff to the moon they have to play their card before we break orbit.
I expect they'd somehow get free, or be rescued by something, but the fallen would need to pay the cab fare themselves.
Being allowed to act in the mortal world doesn't mean the white god would agree to hold their hand while they do it.
I don't want to put a fallen angel inside Molly's soul, but I'm curious about how the fluff of the hells would actually play out with ours.They can escape. That is the point of those charms. The inner world is a mini Yomi Wan and it must always have an escape clause. Same with Infernal inner world.
The description of their history says something to the effect that the jade court vampires could only start breaking free once the Yama kings decided to dam up the flow of souls for their benefit. The implication being that they were impossible to escape save through being cleansed of sin and deliberately released before that.
So if we run on the rules for that variety of hell, would it be a perfect prison again if we specifically leave a way to earn an out?
Though honestly even if that was the case a fallen angel and a mortal soul are very different things, I wouldn't expect a perfect prison for the latter to contain the former as easily.