Bead blast and reblue is the easiest way I’ve found.
About anything in a blast cabinet will make short work of Cerakote and most any other layed on surface finish.
We use alum oxide as the media and properly applied Ceracoat is very easy to remove.
More durable treatments like TiAlN or DLC take much more effort as it penetrates the substrate and you have to remove below the orignial substrate.
Cerakote is just a built up layer on the the surface and anything in a blast cabinet will remove it quicky.
