You're thinking too much
You can't stack leveling kits like that... It's just a terrible idea. The max you want to lift the front end of these trucks without doing a diff drop and cross member drop is about 2.5". Any more than that and your CV shafts and lower A-arms will be at ridiculous angles. It won't work at all and you'll be wearing through ball joints and tires in no time.
Also, it's only the front Bilsteins that give you any lift. Bilsteins for the rear do not provide any lift, only a smoother ride.