1) I don't know what the Prodigy pickguards look like, but Warmoth makes custom pickguards in pretty much any color/texture for really cheap. I got the black pearloid pickguard in this picture for only $28, and it reached my house in less than 3 days.
2) You'd have to rout a small cavity and drill a hole to do that. It's do-able, but might be a bit hard.
3) If the problem is with the bridge, then yes, new saddles, maybe even a new bridge would solve your problem.
4) I'm guessing that this is an old guitar. A re-finish might be in order. An easy one to do might be tung oil, actually. I'm waiting on my tung oil neck to arrive (this week!!) and I hear that it's a delicate yet amazingly smooth finish. You can buy the stuff for $15 at your local hardware store (usually) and it takes a very short time to finish it. You'd probably want to look into other options too, though. Satin, gloss, whatever floats your yacht.