I don't totally understand your question, however, I think you are imediately going to have a problem trying to sync to two clocks. As it is a digitally clocked feed from the Digico, I suspect you are going to have to provide the clock feed to the video truck to prevent any conflict.
As to the SRC point, surely you can get the digico feed to be 48khz? More than this sounds like a large amount of additional work. Good luck.
