Anything waterproof is going to have significantly reduced breathability. This will likely wet your insulation more than a normal sleeping bag shell when used in a tent. Just get a normal, breathable, non-waterproof shell with DWR (durable water repellent). It will be cheaper, lighter, and warmer. You can also buy DWR spray or wash-in.

Get a tent where the condensation is manageable through ventilation and not being easy to brush up against the walls or drip on you in a hard rain.