Hardtop cover
I don't see the huge gain over a softtop or even T-Tops really. They are hard and very solid when in, then take them out and enjoy the open roof. i know it's not the same as no roof (I personally am not a huge fan of convertibles. I need some sort of support over me) But it gets close when you are cruising and don't look up.
I just think your goals are close to impossible

