Okay, here’s how I’d do it:
The first turn would be a mirror image of itself. Rather than being a tight right that opens into a gentler bend, I’d make a gentle right that deploys into a tight corner, forcing drivers to brake as they turn.
Next, it’s a downhill, left-hand sweeper that bypasses the existing turn two entirely. The cars funnel out onto the straight where Massa had his accident.
I’d tighten the existing turn four ever so slightly, raise the inside kerb and bring the outside wall in much closer.
The chicane would stay in place, but like the first turns, it would be reversed: gentle approach, tight second half.
I’d largely keep the next sequence of bends intact, but I’d exaggerate them somehow.
And in the final section, I’d re-create Magny Cours’ Grande Courbe bend for the final turn. Rather than going right before climbing the hill, the cars would go left, bypass the switchback, and enter the new Grande Courbe for the climb to the Start/Finish line.