I've used standard innertube patches inside a tire with good results. The hole was about 2mm in diameter with a perfectly round little divot taken out of the tread of a 28mm tire on a hybrid bike. Used the largest Parks innertube patch I had. Cleaned the inside of the tire with some acetone and let it dry before scuffing it with sandpaper. After the patch was cured I filled the divot with a dab of Shoe Goo and the tire lasted another few hundred miles and was still holding when I replaced it because of overall wear, not the patch. I wouldn't recommend this for general tire repair, but if you live out in the sticks and it will be a few days to get a new tire, it could get you by for a while. I'd move the tire to the back if it isn't already there.