Whisk the flour and salt in a medium bowl. In a separate bowl, whisk the milk, lemon juice, vanilla, and beaten eggs, then gradually whisk the wet mixture into the flour until smooth.
Rest the batter for 15 minutes. Meanwhile, cook the blueberries, sugar, lemon zest, and lemon juice in a nonstick skillet over medium-low heat for 10 to 12 minutes, until the berries are tender and the juices bubble.
Beat the cold cream until thickened, add the honey, and continue beating to soft peaks. Refrigerate the honey whipped cream until needed.
Lightly grease a nonstick skillet over medium heat. Pour in 1/3 cup batter and swirl to coat the base. Cook about 2 minutes, until the edges curl and the underside is golden; flip and cook 1 minute more. Repeat with the remaining batter.
Spread each crepe with honey whipped cream, roll or fold into a triangle, and top with warm blueberry sauce.