IIS 7 and CF10 Service Unavailable error message config.

I don't expect much luck at getting a reply here but here goes..

After having problems with one of the CF10 updates running under IIS 7 there was a 'Service Unavailable' (503) error message from the Tomcat server showing on all the sites we run.

What we want to do is set up a system where IIS takes over if CF goes down and shows a nice error message which is different on each site.

Alternatively a way to easilly switch IIS from using CF to point each site to another local site while the CF server is down.

Any suggestions?