(Without knowledge of where exits are/queues connect/etc)
With the attraction being closed for HHN, I'm going to guess the portal will be set up on South Street, near the Beat Builders set. It'll probably wind us through the outdoor section of the queue and possibly part of the indoor queue, then back out to the tent. Assuming the exit of the tent is on the gift shop side, maybe there's a side door in that area that will spit us out in front of the gift shop? Unless there's a scare zone there.
If there's a zone in San Fran, then maybe we'll loop through the indoor queue, enter the tent from the gift shop side behind the facade, then exit out of the gate next to the F&F entrance.
I put way too much thought into this..