Each planet is replaced by a hyperbolic projection of limited size.
Requires the Infinite Resources dependency to be playable. It is also strongly recommended to put 'Fulgora Islands' map sliders to the max.
Can we create an online scenario? Become an online player with one planet, each planet is responsible for collecting different substances, and new players can selectively enter that planet to start developing. Jointly challenge counterattacks from local natives (non Zergs or players).
This would be a separate project to this mod. Planet Picker does most what you describe; you can also use Any Planet Start in singleplayer. Each is compatible with Small Space Age.