Have you tried call forwarding 0 to another extension? You could also try using uniform dialplan to map 0 differently but that requires you to make the change and it's not possible for the user to control.
I prefer setting up 0 as a UDP extension. This gives the flexibility of using location based AAR to route the call differently for different sites/locations. Send the call to a VDN which goes to the operator or to another station depending on the conditions. Assuming you have EAS activated you can use variables to route the calls specific ways.
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