Yes instead, infact your device contains all the legacy required kexts to make wifi and encryption to work and copying it into Mojave Installer path /S/L/PrelinkedKernels/, will be a valid bootable kextcache, and it will work because the Mojave kernel is embedded in, in any MacOS Installer there is no /System/Library/Kernels folder, so no risk to rebuild a new kextcache on different machines when booting.
But yours is a good idea to use a pre-prelinkedkernel probably in this way also the HDA Audio could work on a Installer.
I think the thing is, we need different prelinkedkernels but not for different devices, only for different path situations. For exemple, all Nvidia devices have the same patch applied and so on for other patches, so in total, we probably don’t need a lot of prelinkedkernels but we do need different ones. Just an idea.