P of D,
I do not disagree with the fact that there have been strong links between danish & french Aristocracy for a long time (let's not forget that the Queen of Denmark is married to the French Count Henri de Laborde de Montpezat), but saying that there was some form of approved "breeding system" is certainly O.T.T.
Should you have any more details or any family tree to support that, I would be very interested in that material.
MF