My son has had custom mill work done, and I don't know how that compared to pre-finished but it didn't sound all that out of line. My suggestion is to pull up the good flooring in that half kitchen and salvage it for a smaller floor somewhere else down the line, and completely replace the kitchen flooring with new wood. No problems with matches, mill-work, and refinishing. Quick and easy and you can call out any finish you want.

Just "googling" around, it looks like narrow strip maple hardwood flooring is pretty readily available in 2 1/4" widths. I know that's 1/4 inch wider than what you have, but I do wonder how noticeable it would be?

Alternatively - pull up the 2". Buy a few boxes of 3" and 4" and mix them in. You'll have a variable width look and no obvious "new" food divide.