i wished we had another entry point at all.
i remember a time when every new game started at mengha, they always promised "don't worry, you will have an alternative start", and once they did, they just made a fucking tutorial...mengha was already a tutorial by design...
i wished we could have another starting planet and not have to go through the "new" starting zone and then mengha.
The best thing would be to have the basic "main quests planets" be done and choose where you want to start, chapters like you said, like when you start a new game, say you want to start on tarkus, or zheng shi, you still have to create your character and level up accordingly, maybe with some basic gear for the level you should have at that point, but not miss any content other than the main quest.
Not only would that be easier to test new contents if, like me, you don't particulary mind making new characters, but it will also make it better to avoid the early stages of the game if you find them a slog to go through.