ha ha, you're probably not going to get quotes from folks. As I know that I wouldn't willingly work to drive down my own prices, if this were an area that I worked in. Unless, someone just really wanted to do this as a challenge. But, you might get recommendations for people who do make stems regularly.
That is a cool looking pipe. If this were my pipe, I wouldn't mind doing the whole thing myself. Heck, I wouldn't mind taking a closer look at it, as a metalsmith, I would love to make one in silver and gold for myself. I could even see using some mixed metals such as Mokugame and hand forging one. I could even see the shank on the stummel having a wide bore to act as a reverse calabash of sorts.
Lovely pipe, and good luck getting that restored. Although small, it could get a work out in my rotation.