Divide sweetened condensed milk and cream cheese between 2 bowls. Blend each mixture until combined.

Add 2 cups milk and both banana pudding mixes to one bowl; stir until thickened. Fold in 1/2 of the sliced bananas, 1/2 of the 12-ounce container of whipped topping, and 1/2 of the wafers.

Add remaining 1/2 cup milk and coffee liqueur to the second bowl. Stir in chocolate pudding mixes until thickened. Fold in remaining 6 ounces whipped topping and graham crackers.

Spread the coffee-chocolate pudding over the bottom of a glass trifle bowl. Layer on 1/2 of the 8-ounce container of whipped topping. Add banana pudding. Top with remaining whipped topping. Refrigerate, 8 hours to overnight.