Just one other possibility that might help out other people in future, would be to use a completely independent lo-fidelity camera setup of some sort that's recording the screen of your monitor during the shoot. I'm thinking of a low-end DSLR or even a smartphone (potentially even the client's!). Obviously for this to be useful you need to have the timecode displayed on the output monitor at all times.
Talk about old school! That brings back memories of the days before quad splitters - when we did multicam shoots we'd make our own by stacking together 4 monitors (these were tube monitors, so they were basically boxes and didn't need to be rigged) and shoot the monitors with another camera going to a 3/4" deck so the director would have a review copy to see all the cameras and do his paper cut.