Reverend won't do the work. They're not a repair place. If you're in their area, you can try Small Box Music. John is a trained luthier and would be willing and able to do the work. But, it won't be cheap - I'd expect $300-400 for the routing job since he'd be working without a template.
Honestly, I'd recommend against it. Not only would you have to significantly alter the body, the pickups would be in different positions than the Dub King when they're done and you won't get that sound. Trade the bass toward a Dub King. Small Box also happens to be a Reverend dealer. Heights is as well, and they may also be willing to take on the work, but again, I think it's far cost and risk prohibitive. Easier to trade the instrument toward one you'd prefer.
If you wish to keep the bass no matter what, you should look into what size your pickups are to find direct replacements. They're out there somewhere. You could also try contacting someone like Turner pickups for a custom job if you can't find what you're looking for off the shelf.
you are right. The cost of the work combined with the cost in parts might actually put me pretty close to the cost of the Dub King. Unfortunately the trade in for the Corsair just isn't much so I would be paying more out of pocket for a Dub King that I would want right now. Time to start saving!
Although the thought of having a pretty unique bass with the Corsair and Reverend guts is pretty tempting. The pickup placement would be closer to the Mercalli than the Dub King