I'm not clear on what "append storage/emulated/0 to the IP address of the connected device" means. Could you elaborate on where this is inserted or changed and in what interface you are hitting ctrl+L? Is this in KDE Connect itself, file manager, or some other part of the OS? What are the current mount points of the devices?
If this is about udev maybe this helps. https://unix.stackexchange.com/questions/799166/linux-auto-mounting-usb-with-udev
There are a couple of threads on ServeTheHome forums where people share experiences. Do consider the security aspect. I'd personally feel wary of exposing any of them to public internet. Even if you don't believe in backdoors, it's likely you won't receive future security fixes for firmware.