StreamOfTheSky
Adventurer
OP, yes, I would allow a wish or miracle to get back all of the stuff lost (just word it carefully, so you don't get...goop). It's not cheating the system to get way beyond your wealth by level, it's to get back what you had fairly acquired already. And loss of hundreds of thousands of gp of items is so incredibly crippling, not allowing something like this would just force the player to roll up a new character anyway.