Start on any of the first three planets: Vulcanus, Gleba, or Fulgora.
Choose your planet in the startup mod settings before starting a new game.
SEO: Vulcanus start, Gleba start, Fulgora start
Would you consider including a startup setting which simply starts the player with the technologies they'd normally need to access whichever planet they choose to start on, instead of restructuring the tech tree?