Actually, another thought, if we're summoning a demon to possess an object, it means that Hollow Mind Possession turns into a much cheaper and easier version of:
Devil-Refining Cauldron (••••) The Exalt may craft an item suitable for habitation by a wicked spirit, and then dissolve a Bane or devil until it is ready to be poured into the prepared vessel. System: This Charm allows the character to create fetishes (see W20, page 221). The character must first craft the item that is to serve as the physical substance of the fetish, and must do so entirely by herself. Then, the Exalt uses this Charm to bind a spirit into the fetish. This may be done either with the spirit's willing cooperation, or after battering it until it has been reduced to 0 Essence and then suspending its dissolution for 24 hours by reflexively spending 1 Essence. Such a "suspended" spirit swirls about within the Exalt's anima until either bound into a fetish, or until the suspension ends, at which point the spirit finishes discorporating. To bind a spirit into a prepared vessel, the Exalt must retire to a ritual space and spend (Fetish's rating) hours and (Fetish's rating x 3) Essence binding the spirit and object together. Because of the high Essence cost of this Charm, it is most easily performed within Dragon Nests.
As a demon possessed object is a Fetish.
Although it's totally up to DragonParadox, I think the original version of the charm may be less probelmatic.