Well, you have kinda answered your own question. Nobody makes the type of barrel you are interested in, so of course there are no smiths who do this type of work.
Why?
Because what you are talking about doing is taking a $150 rifle, and spending $400 on it, to end up with a $175 rifle.
Here is your best solution: Trade your current SKS in for a para-trooper model, which has a much shorter barrel, then if perhaps you can remove that barrel, have it chrome plated (or other wonder metal), and then have it re-installed.
Just some thoughts.
Mannyrock