Also, do note that no one outside of your area knows what you actually do. Did you split into two tables or play a 7 person table? I don't know, nor do I really care.
Do what works for your home group and make sure that the paperwork checks out.
If you truly believe that playing a 7 person table will be the best for your group so that all have fun, then do it. The point of this whole thing is to have fun, not get caught up in rule minutia.
If you'd like creative ideas to solving such problems feel free to private message me. I'm sure that together we'll be able to deal with unique situations.