You could download CS4 30 day trial and install it as the only extension installed.
Then you could move the installed files from the Configuration folder... you would have to be careful not to move DW created files and menu files since they may cause problems with your core DW functionality.
This would mean all menu access would be gone and no objects would appear, so your only access might be the server behaviors directly... maybe... but again this is deep down uncharted waters with unsupported and untested environments so it might not be as easy as it sounds.