Let's organize a tournament.

I would rather suggest a separate bracket for experienced and new players – this would create a fair playoff until the super final. And in the super final, a game could be played with a handicap – for example, the new player chooses the map color and castle. Or, in the general playoff, give a handicap (perhaps not so significant) to players from the new player bracket.

I support this, it hasn't been done before, as far as I remember.
As a rule, weaker players are eliminated in the early stages of the playoff, but with separate brackets, there would be a chance to reach the final in their weight category. For the super final, it could be arranged so that, for example, the Warlock is chosen from 4 races, and the list of races is chosen by the weaker player for himself and his opponent. So that he has a chance to keep the races with which he can play best, and the "experienced player" shouldn't care what he plays.