If you block it off with wall or fence pieces (the entrance/exit square) you can then disable clearance checks and just place a queue line / path in the square. You will also have to figure out how to use the tile inspector to make it look like the path/queue connects though. You can also enable invisible as a color through the cheat menu if you don't want the walls to be visible. I would check some more in depth tutorials on youtube but that is my cursory explanation (I just realized this thread is 7 years old, I hope he figured it out lmao)
