Could we get a Storage Box, Similar to the Pepys Box. but with the ability to place items inside, and have them available in the partner box in a friends Abeyance/Home realm. I'd imagine most of the infrastructure is already there (pepys box) and the Address Card system. Sorta like a Guild Bank, so to speak. OR See comment below.
OP EDIT: A far simpler solution would be to add Permissions to the Pepys Box, like there are for the normal storage, but for Party members or something similar.