If there is enough straight tube on either side of the fitting, you may be able to cut the fitting flange off each tube and use the appropriate Swagelok (R) fitting to join the tubes to each other.

Where I work we do this all the time on auto A/C systems for testing and if the fittings are installed according to directions they will stay leak tight indefinitely.

Call around to "A/C and refrigeration supply" houses in the nearest large metro area to see what they have.

The downside of this is that the line that was not damaged will now be non-standard and if for any reason you decided to go back to original condition you would have to replace the line.