Why not make the pick up cavity in the back of the guitar same as a pot cavity

@mezy – not a daft idea at all.
I think that’s how dummy coils are often mounted (and hidden completely).
https://andertons-productimages.imgix.net/291672-epiphone_ltd_ed_lee_malia_rd_custom_artisan_outfit_guitar_-_walnut_-_body%5B1%5D.jpg?w=768&h=768&fit=fill&bg=FFFFFF&auto=format&ixlib=imgixjs-3.3.2
https://andertons-productimages.imgix.net/291674-epiphone_ltd_ed_lee_malia_rd_custom_artisan_outfit_guitar_-_walnut_-_back%5B1%5D.jpg?w=768&h=768&fit=fill&bg=FFFFFF&auto=format&ixlib=imgixjs-3.3.2