Like the OA patch, sew it on the top and sides and along the bottom leaving it unsewn near the button just large enough to get your fingers in there to button the button.
I would say the boy needs his health form and that's it. Parents driving their scout to a camp do not need a tour permit and if the lone scout gets into the provisional troop, then that should solve the leadership issue. The parent may need to pay for his/her attendance due to the fact that the 2-deep of the provisional may have already been met.
This is all neat and tidy paperwork issue, but when it comes to practicality, how does a real lone scout get to go anywhere if there is no one to sign his tour permit? If son and dad want to travel half way across the country to attend a summer camp, do they need to keep with the # hours driven or miles covered per day? I don't believe a scout in his parent's car does not need the permit anymore than a parent driving their son to any other activity in BSA.