Given how fast, cheap and easy it is to travel in the game, I don't see SE spending time developing something like this. Anyone can get to a retainer bell in literally seconds. If it took a long time or was very costly then your suggestion might have some weight. But this isn't the case.

I wouldn't say no to having this feature. I just don't think SE would develop something they would see as mostly unnecessary.

Also it goes against what little lore we have about linkpearls. They're only for audio communication as far as we're aware. Currently you need to take the collected items from your retainers before you can send them on another venture, which goes beyond what we know of linkpearl technology. But SE could just call it something else if they brought it in.