Set oven to 350°F (175°C), positioning rack in the lower half.
Slice pumpkin in half from top to bottom, remove seeds, lay halves cut side down on a baking sheet, and roast 1 hour. Allow to cool, then peel off skin.
In the meantime, press crust into pie plate and chill at least 30 minutes, up to step 4.
After pumpkin has roasted and is cool enough to touch, strip away all skin.
Blind bake the crust: line with parchment paper and fill with dry beans, pie weights, small dried pasta shapes, or clean pennies/change. Bake 10–12 minutes.
While crust blind bakes, place 2 cups pumpkin flesh, white sugar, brown sugar, ginger, cinnamon, cloves, nutmeg, and salt in a food processor; pulse 1 minute.
Move puree to a saucepan and stir with a whisk over medium heat until hot, roughly 5 minutes.
Stir in half-and-half and maple syrup; whisk until smooth. Take off heat.
Stir in eggs and vanilla extract; whisk until smooth.
Transfer pumpkin filling into the prepared pie plate.
Bake roughly 1 hour, until a toothpick poked in the middle comes out clean. Let cool 1 hour before slicing.