I travel using the wheelchair option on every trip which is often twice a year due to a medical condition.
Whenever I am traveling with someone, I always get to the outside before them. The Immigration Line has a special kiosk for wheelchairs thus circumventing the long Immigration Line and then there is a special area for Customs on the right side of the hall where you are taken. Quick. Quick. Only about 20 minutes average from the plane to the door.
I would just save my money and sit outside and wait for your friends either on the left side of the exit doors or the right side (decide that in advance).
This is what I do and it always seems to work just fine.
Peace and Guidance