Shellac is pretty but not very hardy. It can be damaged by alcohol, water, oils, and probably sun. For a finish, you might need to go urethane or tung oil (but I don’t know much about it). I’m considering the lemon oil. It has worked for years on an unfinished chest of drawers.
If you look at the pleated corners on the Model 3's wood dash, the wood appears to be paper thin. I'd be afraid that any wood treatment would penetrate the wood, dissolve the adhesive, and cause the wood to delaminate.