I didn't say it would be easy. I have had people do work on vintage pieces of mine that was indistinguishable afterwards.
If it is an LS200 these guitars are fetching prices around $10,000 in some cases.
View attachment 14200
LS200 Gallery
Worth the effort to find someone and spend a few hundred dollars in my opinion.
Every town of decent size should have a luthier than can work with lacquer.
Cashew was used on select Japanese guitars to give an amber tone and an aged look and has been used on Japanese furniture for ages. Would not be hard to research. I have created a whole thread on it.
Cashew Finish
The unique part is using it on guitars, which Fernandes did initially in 1975 or so.
The down side is the drying time. Probably why it was only used on the most expensive models.
Worth some effort. It's a prize guitar, and its a tragedy what someone did to it.
The vibrant color of the top was the giveaway when I first saw it. An amber finish would tone that down and give a warmer look. Even straight lacquer would help.
Again, a luthier of some skill could sort this out. I would imagine they would do some test areas and see if the original finish that is remaining has an amber color to it. If not, the job got easier and you have an LS150.
Good luck whatever you do.