rando user here, but if firmware flashing would be relegated to an external media to be able to do, then could it not be possible to create an additional relaxed (current config) version of the locked down kernel as an addon?
Only interested users would bother installing it and it could be something they have to re-do each update since the core would overwrite /boot and /lib/modules and invalidate the previously installed addon by version requirement (the update providing a new version they would have to install if needed again).
This would minimize the footprint of 'insecure" installs since it would only be insecure on-demand each time the user updates and it should (afaik) not require any other changes to the dist to support without requiring external OS's for users. Unless pakfire's can't update the kernel for some specific reason.