It delays you slightly but I wouldn't recommend splitting your groups up at all. That leaves even more room for error. I'll be a group of 4 Saturday which is the most I've gone with in the post first come first serve days. What I've done is "color code" my family to the loudest, brightest character that will help in the identification process. If you have people with other last names, this could be even more helpful.
As referenced in prior posts, there is a “Select All” button, right? Will be there in 2 weeks with a party of 9 and I’ve cleaned up my MDE friends list so it’s just those 9.