Find a French polisher...
As previously said, it doesn’t have to be a guitar maker/repairer - in fact other than with classical instruments, shellac is an uncommon finish for guitars
To the best of my knowledge violin makers never use French polishing as a technique, or shellac as a finish. Instruments from this family are usually finished with spirit varnish over all manner of treatments to colour the wood.
A furniture restorer, skilled in French polish repairs is almost certainly your best bet.
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