DT has been doing flat repairs for free for decades. You don't need any certificates. You just show up. Doesn't matter where you got/bought your tires from.
When I was 17 and had just moved back to Michigan (after ~8 years in Texas), I rear ended an old lady in a brand-new Mercury Marquis. It was my first time driving in snow.
You're most certainly welcome to disagree, as that's your opinion. But I can most certainly tell you that my black 2016 Corvette Z06 most certainly showed scratching from putting the cover on/off when it was not spotless. That silver hides more than you think.
The SVE pucks install permanently, so they are there if you take it to a shop. Hockey pucks aren't. They are also prominently labeled so the tech SEES them and uses them.
But, sure, if you're a cheap ass, get some hockey pucks. :)
I looked at a bunch, and if I go with the jack pucks over the jack rail, I'll get those. But I'm really leaning towards the Steeda jack rails.
Steeda 555 5205 Mustang Coupe Low-Profile Jacking Rails (15-24)
or
Steeda 555 5212 Mustang Coupe Full-Length Jacking Rails (15-24)
Here are a few...
The Ford Aerodynamics Engineer in charge of the S650 already confirmed you can close them off without affecting anything related to aerodynamics. AFAIC, there is nothing conflicting about his words to me.