I think a Spa 12 Hour race as the 'halo event' could work depending on when they want to do it. Shouldn't be too close to the 24H of Le Mans race. Maybe like at the end of March, start the season with a 12 Hour race at Spa. Could attract some WEC P2 and GTE teams as well that want to prepare for the WEC season and the WEC Spa 6H race.
And GT3 teams could also come if they want to prepare for the Spa 24H race.
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