So Novak should announce a bounty of 1 Million $ of his own money on Sinner/Alcaraz in every Slam in 2025, whoever can beat them directly collects the money from him. This would motivate Kyrgios/Dimitrov/Khacha etc to play out of their skin and take out the threats.
Grass is the best chance now, I agree, HCs look verd now and Clay was never a young man's surface, even Grass never was but at least on Grass weird upsets do happen.