I've never been to ToT at DLR, but the concept of changing the one at DHS just baffles me. It's a flawless ride right now, from the theming inside and out (and the perfect integration with old-school Hollywood), to the story that explains what happened, to the fact that you're in a freaking ELEVATOR, which beautifully plays on fears that everyone can relate to. You're in an elevator, with creepiness all around. Is this thing safe? Hey, wait - you're moving horizontally down the hotel hallway??!! You see ghosts of the family who died in an elevator accident? And then the wonderful freefall(s).
There is no way to improve this ride with any form of GoG overlay. Absolutely the worst idea ever.