How about a new WundrBar flavor "Strawberry White Chocolate"?
Most protein bars/shakes, powerbars etc already offer this flavor and since you already have the white chocolate (WundrBar) and the strawberry (shake) this might be quite easy for you...
I know I would really love this flavor!
btw: I also love the "Strawberry cheesecake" idea! (for shakes or bars)