What if we create a registration form for such a tournament and see how many people would be interested?

Complete beginners are unlikely to participate in such a tournament. And the definition of a beginner is quite vague these days. I think it's a good idea. In the first round, average players will gain experience playing against strong players, which is exactly the way to improve their skills. We need to limit the number of applications per player. For example, create tiers based on skill level and require players to play against one player from each tier.