In my genkernel setup, I'm using KERNEL_FILENAME and KERNEL_SYMLINK_FILENAME to change the names of the files installed to /boot (reason: a "production" and a "maintenance" installation sharing the same boot partition - this is used to keep the files separated). I would like to move from genkernel to distribution kernels for easier maintenance, but I'm missing this feature. Would it be possible to add it? Reproducible: Always forum discussion for reference: https://forums.gentoo.org/viewtopic-p-8736965.html#8736965
I suspect you can configure installkernel somehow to do this.