IF there is another small child who doesn't meet the height requirements for something, you could separate the larger group and get two swap passes that way. This would require you to not approach the CM as a large clump. Instead, two smaller groups would go up to the CM, one group at a time, each with a small child, and each with an extra family member who would stay behind with the child. It would be best to let a couple groups go between you and also to already be separated upon reaching the ride area so CMs don't get suspicious. I know most of them are happy to help but you don't want Grumpy the CM spoiling your plan.
Example: Mom, Dad, Big Sis, Big Bro, Lil Sis, Lil Bro, G-ma, G-pa and Baby.
Group 1 (the girls): Mom, Big Sis, Lil Sis, G-ma and Baby go to the CM and ask for a RS pass. G-ma and baby stay behind.
Group 2 (the boys): Dad, Big Bro, G-pa and Lil Bro (who is too short) go to the CM and ask for a RS pass. G-pa and Lil bro stay behind.
Once all the original riders have finished, they come back to G-ma, G-pa and the small people. You have now collected two RS passes letting 4 (or 6) people into the line again.