Mash up 1/2 cup of the blue cheese in a bowl until smooth; add the mayonnaise, yogurt, lemon juice and Dijon mustard and mix until combined. Season to taste with salt and pepper. If the dressing is too thick for your taste, add a bit of buttermilk or water to thin down. Cover and refrigerate until ready to use.
Lay the iceberg wedges on a platter or one on each individual plate.
Top with a generous drizzle of dressing, then sprinkle with the cherry tomatoes and the remaining 1/2 cup blue cheese. Top each with strip of crispy bacon.