Looks like 4 teams from the Southern Cup will be doing the three guest races in the North to score points for the overall trophy:
https://north.gt4series.com/file/dow...ds%20Hatch.pdf
More than I expected, less than I had hoped for. We won't know which Northern teams will go for the EU title until Pau in two weeks' time, but just from the French entries, Alain Ferté and Greg Demoustier gotta be the favorites.