Set up a bain-marie (or a heatproof bowl over a saucepan of barely simmering water). Place the white chocolate in the bowl and melt gently over low heat, stirring continuously until almost fully melted.
Remove the bowl from the heat and transfer the melted chocolate to a mixing bowl; add 1/2 cup coconut flakes, the coconut milk cream, vanilla extract and almond flour.
Stir the mixture until well combined; if it seems too runny, fold in a little more coconut flakes until you have a medium-set, scoopable mixture.
Place the bowl in the freezer for 10 minutes to firm up slightly.
Divide the chilled mixture into small portions. Press one roasted hazelnut into the center of each portion and roll into a smooth ball.
Spread the remaining coconut flakes on a plate and roll each truffle in the coconut to coat evenly.
Refrigerate the truffles until fully set, about 1 hour, then serve.