Honestly, no amount of cuts will turn this into a good movie, and any young one is better off seeing the original classics. Tell him that TFA is a boring ripoff and TLJ is a nihilistic middle finger (“naughty word”) to the fans. They were made by greedy people who didn’t care about making Star Wars good anymore.
The young lad will likely see the classics regardless - though the OP, as stated… ‘I have a 7 year old son who desperately wants to watch The Force Awakens’…
Mate, this thread is for coming up with ideas and suggestions to help achieve a PG Edit of the The Force Awakens film. It is not for people to put a downer on the ideas and contributions here - or give their opinion it is not worth the effort - in the way you have.
The young lad doesn’t likely need to be told to enjoy TFA & TLJ or not. Maybe he can even watch them with an open mind…
Though feel free to take your views to the TFA and TLJ review threads.