If you are using both from same handset, why not simply add an outbound route for the other GV # and use a dialing pattern (ex: 9|nxxnxxxxxx) to place calls from that #. The caller ID will show correctly.
You could also point that second gv #'s inbound routing to the first extension. That way you aren't having to maintain two connections from your handset. It probably will use less battery that way as well.
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