This is possible, but you would have to write your own web interface that leverages ipMonitor's SOAP interface to pull monitor status from both installations.
As your installation grows, you might consider moving to Orion + EOC, which is specifically designed to address this use-case.
Yes there is. I'm doing this with around 80 locations on one screen using the SOAP interfaces and a custom C# .NET application.
I have been using the Multistatusview application to make custom NOC views on version 9.0.4 it has worked well so far, it uses the SOAP interface and IIS, I am not sure if you can add multiple SOAP servers but it would be worth a try.