gorrilla glue should be fine for the ballast because like you said, it will never be pulled on.
as for screw eyes, i dont use them. i use twisted wire loops, but i know that a lot, if not most people use screw eyes. since i dont use them, i dont know much about using them, but i do know that you want the threaded part of the screw to be pretty long and you also want to epoxy the screw eye in.
as for epoxy, you can get it anywhere, walmart, lowe's, true value, local hardware store...
it will cost you about 3-4 bucks for a tube, and a tube will last you for several baits. a "tube" is acutally a double-syringe (two tubes put together) with a plunger at the top that pushes the two parts out of the tube.