I have stopped plugging sidewalls but I've done it before. I still plug motorcycle tires. On car tires I take them to a friends shop and they put a butyl patch on the inside of the tire. That should work on the sidewall too.I plugged a hole in the sidewall of one of the tires on my dad's Mazda and I drove it home from Tennessee.
As far as I know he still has that tire on the car. 😁