I've never seen a Starcaster in the flesh, so I'm going to assume the back is solid, i.e., no plastic cover to access the electronics.
IF that's the case . . . . .
It can be a handful to switch this stuff out. The pickups (provided you can find exact replacements, I'm guessing they're the same size as the EBO neck pickups, but then, what do I know . . . . ) are no big deal to switch out, provided there's enough extra length in the leads from the pots.
Now, the pots. When I worked at Gibson, we wired quite a few 335-style instruments, like this bass. Typically, we'd build the entire wiring harness (that is, all four pots, with the leads for the jack and the pickups). We had a little tool that looked a lot like a soundpost tool for a violin. We'd pass the harness through the pickup holes, and then push the pots thru the holes in the body one at a time, getting the nut started on each to hold it in place, then the other 3 one by one the same way. It's a real picnic, let me tell you. Not bad after you've done it a couple hundred times, but the first time? Bring your lunch . . . . .