I think we all agree FIA is the root of evil, don't we? And today showed their true face, they can't prevent F1 from scheduling a clash with Le Mans, despite that it was said no FIA-sanctioned series will clash with LM24 now that it's in the FIA WEC.
So, what would your alternative WDC look like without FIA-sanctioned races (no F1, WEC, WTCC races, etc.)? A circuit hosting a FIA-sanctioned event doesn't disqualify it from holding an alternative WDC event, though in a different type of racing.
Here's mine incl. open-wheel, sports, touring, and stock cars. (I didn't include rallying because it's so different from circuit racing. But you can include.) Five of each category, only one race per venue (e.g. only Daytona 500 but no Rolex 24).
Daytona 500
Clipsal 500 Adelaide (touring cars)
12 Hours of Sebring
Grand Prix of Long Beach
Talladega (stock cars)
Grand Prix of San Marino (Imola)
Indianapolis 500
Coca-Cola 600 (mandatory double duty)
Norisring (touring cars)
Grand Prix of Road America
Grand Prix of Donington
Watkins Glen (stock cars)
Bristol (stock cars)
Suzuka 1000 (sports cars)
Petit Le Mans
Bathurst 1000
Brands Hatch (touring cars)
Guia Race of Macau (touring cars)
Mil Milhas Brasil (1000 miles, sports cars)
24 Hours of Potrero de los Funes (sports cars)