Here's a very rough photoshop of what I think would be the simplest route.
But....
Can I have the shower head on the wall separate from the faucet? How would the shower head diversion be controlled?
Is there room on the tub ledge to accommodate the glass? (I don't think so)
I want to keep the low wall for privacy to the toilet. I don't like the idea of glass all the way to the floor.