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The right barrel shoots perfectly to both the open sights and the scope(of course). It's the left that seems more problematic.

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The question is have it re-regulated and maybe lose this accuracy

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and have to re-blue the barrels as a result

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Re-regulating can be done on some doubles with little damage to the blue and I have done several that way.
If the rifle is a show piece it will need to be reblued but if it is to be used in the field, and the regulator knows his job, it is possible to avoid a reblue.
Much depends on the construction of the barrels regarding how the foresight ramp is attached.(and other things)

If you are not 100% certain that you can do the job correctly yourself, give the gun to someone who has proven that they can.
Anyone can put flame to a barrel set and watch the solder melt and hit the floor!
It's getting all the solder/wedge/barrels/ribs/sights back where they should be and getting the barrels to shoot together and having a strong neat job at the end which makes the difference between a regulator and a lawn mower mechanic!

And definately regulate to the scope not the irons on a rifle of that caliber.

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