Hehehe
He must have missed a zero somewhere in there.
I would go with the dowel method for two reasons. Although the toothpick idea is good, it's going to look like shit.
1. Getting a piece of dowel rod is cheap (make sure it's the same wood as the body) and buy it about 1/4" in diameter than your existing drilled holes. Bore out the hole slightly smaller than the diameter of the dowel rod, cut the dowel and match the grain to that of the body. Glue the dowel in place. The idea of making a larger hole for the dowel is that you will be drilling into wood and not glue when you try this again.
2.Correct me if I'm wrong but the anchoring of the bridge, as long as it's glued or epoxied to the body solidly, will have no effect on the tone. The tone is achieved from the break of the strings across the bridge and the vibration of the strings above the pickups. Since there is minimal vibration near the anchoring screws of the bridge and tailpiece, either of these methods should not effect the guitar significantly.
Since the body itself seems to be in good shape, you should be good to go. Then again, I could be talking out of my a**. Good Luck.