you can get a replacement preamp on evilbay/amazon/dhgate/alliedexpress for $16 or so. You might have to make a small cut depending on the size, but this would look original, preserve any value, and be more functional. Just sayin. I bought a classical (ibanez exotic series) a while back and the eq was having issues... bought a fishman knockoff on allied and it's very nice. Sounds great, has a tuner, and was pretty easy to install.
barring that... go on evilbay and for $10 you can get a headstock veneer. cut to size, screw on.
here's one under $5
https://www.ebay.com/itm/Acoustic-Guitar-Passive-Volume-Control-EQ-Equalizer-Preamp-Amplifier-Pickup/114281841862?hash=item1a9bba84c6:g:I4AAAOSwOkle-cZr
another for $13
https://www.ebay.com/itm/LC-4-4-Band-Acoustic-Guitar-Pickup-Preamp-EQ-LCD-Tuner-System-Equalizer-H1/124292499913?hash=item1cf06909c9:g:PHMAAOSwfD9fLMMo