Indeed it's a bit weird, though there is one or two cases by RAW that deal half damage on an attack miss so I think Shadow Blade's functionality is ok. We'll see what I can come up with for Umbral.
Force theme is already there on page 35. I'm still deciding the theme layout between force and telekinesis as there is some crossover, especially in 3.5/PF psionics.
I think the idea is really promising. I've already been working on it for quite a while now and it'll probably take quite a bit more work, but I'm excited to see how it'll work in the end. Thanks for the continued feedback.