this is indeed a good solution.
The more color info you have the better the key will be.
Any 422 codec will have a better result than other HD codecs like HDV, XDCAM, …
If the client uses a Sony EX1, JVC HM-700 or similar camera the HD-SDI output will give a full 422 signal for the KiPro to record while the onboard recording on the memory cards will be 420 or 411.
In short go for it.
Hemeleers Gunter
Mac Pro, Imac 24″, Macbook Pro 15″ all intel