A good option for monitoring would be an UltraVNC SingleClick customized for your setup. http://bit.ly/MwCOGP
You can have it as a customized app like Nick suggested and just start it when you need to free up your RC licenses.
I used this at a job for a few years as the primary remote support option; VNC as always is a little finicky in situations. But you can setup the SC to point to a static ip or domain (if need to use dyn) with port 443 (bypasses most firewalls). It runs really well over all kinds of internet connections and really easy to create, setup and start when needed.
If you have any questions about it; let me know I can provide some more details on an optimal setup and configuration for it.
Chief Operating Officer, dSupportOnline official support of Foolish IT
& long time tech friend of Nick & avid Foolish IT product user since before Foolish IT was even created!