Notification Page disconnected from primary application server

Our Appian instance is in the Appian Cloud. The main application server is scheduled for a 3-hour maintenance downtime.

Is there a way to setup a separate and simple notification page, disconnected from the down app server that notifies users that connect that the system will be down until X time?

If this is not available, which I imagine it is not...I think that it could be very helpful. 

Do you know how I could submit a feature request for the same?

Thanks!

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