I know that the Poly, GF and WL CAN be on the same route, but I'm not sure about CR.
We were successful in hiding a switch from WL to GF from our kids (they're 16 and 13 so it was quite a trick) until we got to the GF, but it took a bit of luck. The head of the line was fine as the sign had both WL and GF on it. The bus happened to be going to both WL and GF, and stopping at GF first. The trick is that you have to confirm verbally for the CM where you are going there and again at the bus. I just spoke quietly and DW distracted the kids.
If all goes well it is possible to get through, but I wouldn't count on being able to keep the secret. If you can it's worth it! Our kids literally were unwilling to get off of the bus for a minute because they thought we were at the wrong resort.