Largely agree with your thoughts though I don't know how much foreigners can really improve the standard play if they can only have 1-2 players. In my ideal world, players would have the freedom to play wherever and domestic FC teams from all over the world would play in a champions league
Wasn't a huge fan of the original zonal format. I'd rather have the a tiered system that only allows the top league to win the trophy, that too only through points.
First-class cricket is not conducive to knockout play, so I'm totally with you there.
Removing knockouts and only allowing the first tier teams to win the trophy would give more space in the schedule for the Duleep Trophy, which I do agree needs to be expanded (the quality of players is more concentrated).