I do that sort of thing by just dedicating an FX unit to that purpose, turning up the channel-to-mix permanently and using the FX master as the send level control. On other desks I’d assign the FX master to a DCA to keep the level control in front of me but on a GLD I don’t have to. 🙂 This is typically how I’d set up a repeating delay for the lead vocal.
It works perfectly well until you need to send more than one channel to that FX, then it falls apart.
Chris