I figured you probably had good reason, but I just had to make sure. I wouldn't be ok with myself if I gave words of wisdom to a bully.
You pretty much already have your game plan. But here's a word of advice - if you're fighting this kid in a real fight, and it's not some wanna-be MMA match type thing, then treat it like a real fight. If he actually "shoots in" and tries to take you down, don't play with a guilotine or neck crank or any of that. Stuff the takedown best you can, but have an arm free, and blast the shit out of the top and upper back of his head with your elbow. You stay clear of the middle or lower part of the back of the head, and the back of the neck, because that shit can be crippling (literally). But just kind of sprawl and use one arm to hold him/hold off the takedown, and just rapid fire that free arm's elbow to his noggin. Unless this kid's scrappy as all get out, I would imagine he'll lose inspiration real quick.
Edit!: Good luck, and be safe.