Unfortunately it doesn't make a difference.
Thanks for the example, it suffers the same limitations as discussed here but the dbus notification method is cool to have nonetheless.

I've been faffing around with all sorts of settings inside the .desktop file, starting the script with invoker etc. and many fail. The pointless cover is at least succesful.

Short of getting the SDK and compiling a shell wrapper, or learning how to register my script with dbus and launch it via dbus, I see no solution.