I have a great luthier near me in Van Nuys, CA who does great work on my ukes and bass ukes. Tell him exactly what you want and he'll do it. Might be a good idea for you to buy the roundwounds and send them along with your bass. Eric's Guitar Shop,
Guitar Repair Shop | Los Angeles, CA - Eric's Guitar Shop, Inc.. He's a great guy, but because he's so good, he gets lots of work, it might take some time to complete. In the past 6 years, he's worked on over a dozen of my instruments. Tell him Michael Kohan made the recommendation.
If you do ship to him, use
www.shipbikes.com, they have a deal with FedEx for half the normal shipping rates. I used them four times in the last couple of months, great service, see this thread;
—>>I found a source to ship basses cheaply!<<—.