What I've read on Broadcast Hunt for AC that only setting the Queue Size and Hold Time will activate the Always Route Member. These both would affect your queue whether people were logged in or not.
Are you mainly looking for this solution to resolve Attendants not being available during business hours and quick turn around to a greeting or person? Or are you looking to not have people in queue after-hours? If you are just concerned about the off-hours then you might want to create Time of day routing with the Pilot Point Number in different partitions with Time Schedules. I don't believe the AC Hunt Groups can reference two different Pilot numbers but you could always put a CTI or Translation Pattern in front of it then have it forward either to the AC Hunt or another Extension/Voicemail afterhours.
Again this wouldn't solve your problem during business hours but it would make after hour calls route differently.
Here is the link to configuring Time of Day routing. I'm not going to detail the steps unless you want me to because I'm unsure if this is what you need to resolve your issue.
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