I was hesitant to reply, I don’t want to advocate breaking any rules. I travel to wdw often as a solo, but meet my sister and her daughter. Usually we all book the same room type, CL or not. Once or twice, I have booked CL, and they did not. In cases like this, I will make sure I am booking a room with the appropriate capacity, and generally use an extra band or key card for access. I figure we could address the additions as needed since we are fewer people than room capacity (typically 5), but no one has given us so much as a look. My niece hardly eats, my sister doesn’t drink, and we use it for apps but not meals, so we are kind of a low impact group. To be clear, I make sure we are not exceeding the capacity of the room booked because I am kind of a goody two shoes, and I stress about this kind of thing! I just changed a room res from a king CL room to a 2 queen CL room with higher capacity, just in case, for an upcoming weekend. And I’m still stressing!!!!
ETA: I know, we should all stay in the same room. It would be cheaper. But I doubt we would enjoy traveling together as much, let's just say....