Wow, sorry to hear about that, hope no one was hurt. In my opinion, it would be better to find another gun and use the barrels from it. Would still be a lot of work and you must stick with the right frame size (FW or Regular frame).
Trying to replace the one barrel which is Nitro Steel, and finding another is probably like trying to find "a needle in a haystack".
You might might try and post this message on the L.C. Smith site,
http://www.lcsmith.org/index.html maybe someone has a spare set of barrels. If you do, post the serial number and whether it is a Featherweight Frame or Regular Frame.
Good luck.