Nice to see a problem solving attitude to the W10 tablet question. I still don't like the task selector approach though. Of course, your layout would need a whole tonne of polish but the concept is better than MS's. If this could include the current app swipe from the left in the current W8 style I would be far more keen.
Have you heard of anyone working on the early stages of such a touch mod to W10, or planning to start one? Much like the third party W8 desktop mods that came out? Ideas such as yours could go a long way to making W10 touch viable, especially with a bit of WC brain storming.