In a bowl, toss the sugar with the lemon zest until incorporated.
In the bowl of a stand mixer with a dough hook attached, combine the yeast, milk, and honey. Let proof for 5-10 minutes, until the mixture froths and bubbles form at the top.
Beat in the eggs, cinnamon, and melted butter. Add in 3 cups of flour to start and mix until fully incorporated. Add flour 1/4 cup at a time and mix until the dough pulls away from the sides of the bowl and is tacky, but not sticky, about 5 minutes. I used about 3 3/4 cup but you may need up to 4.
Cover the bowl with plastic wrap or a clean towel. Let rise in a warm, draft-free place for 60-90 minutes, until doubled in size.
When the dough is doubled, punch down and dump onto a clean, floured surface. Roll the dough into an approximately 16x10 inch rectangle. Spread with the softened butter and sprinkle 1/2 cup of lemon sugar overtop. Dust with 1 1/2 cups of the berries. Roll into a log from the long side. Use a sharp knife or unflavored dental floss to slice into 12 rolls.
Grease a large baking dish or quarter sheetpan with butter. Set the rolls in the dish cut side up. Cover and let rise 30-45 minutes longer until doubled.
While the rolls rise, preheat oven to 375 degrees.
Uncover the rolls and bake for 20-25 minutes until golden brown.
When the rolls are finished, make the icing. Beat together the powdered sugar, cream cheese, butter, and lemon juice until fluffy and smooth, about 2-3 minutes. If needed, thin with 1 tablespoon of milk or water at a time to achieve the desired consistency.
Toss the remaining 1/2 cup of blueberries with 2-4 tablespoons of lemon sugar. Spread the icing over the warm rolls and top with the sugared blueberries. Serve warm.