Suppose that there was a docking bay on the CC, not like the other docks, but more like a hatch on the side, where an Evac Transport could dock and drop off or load up Colonists. To build a second colony you would have to have colonists actually on site, not just assume they "teleport" from one colony to the next. This wouldn't hamper building remote colonies too much, as the Colonists are simply brought along in one extra vehicle, and enter the colony after the CC is completed.