Here is a suggestion, which might resolve your issue.
Get an ATA, and configure another PBXes extension on it. Hook up a cordless (DECT) phone on it.
Create a Ring group with the original operator's extension and the new ATA's extension. In the "ring strategy" leave the default "ringall" setting.
Assign the Ring Group you just created, as the Destination for the existing Inbound Route. Now when the operator's line rings she will be able to answer from any of the 2 extensions, one of which can move around.