I think it would be an interesting item to see as a periodic spawn on the map that you collect and it instantly converts all or part of your unsecured souls into secured souls, similar to the bridge buffs.. It would be a pretty minor objective, so you could drop in somewhere obscure like in the subway tunnels or something. It wouldn't see much contest, but I could see someone wanting to stop by and grab it before they go in to try to gank or something like that.
It could add a fun extra layer to the game.