Since you have CMs at both locations, your phones will stay registered to CM when the MAN goes down, so you can not use the "forward on unregistered" feature. Unfortunatelly there is nothing you will be able to do to make it work :-( Translation Patterns, Route Patterns will not do it as the phone will always have presedence, people will need to dial full DIDs.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.