I don't understand the carbon barrels either.Yeah, lots of gunsmiths will turn a barrel to your desired profile and chamber a prefit. It’s just going to cost quite a bit more than a price point barrel like McGowan, PBB or a limited option run for efficiency like the PVA osprey. I wouldn’t be surprised if PVA would make exactly what you want as a custom order at a higher price.
I wish the carbon barrel silliness would go away and the void would be filled with sporter contours with flared ends for 5/8” threads.
They weigh more than a hunting sporter barrel. Carbon barrels are for heavy rifles.
And if you're not hunting and packing the rifle who cares how much it weighs? No reason not to just get a heavy contour steel.