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I created a CLI tool to generate unified kernel images a year or two ago, it's called genuki and it's in the AUR. It doesn't generate a kernel image, so you still need to use mkinitcpio or dracut but once you get those ready it allows you to configure each EFI entry you want separately in a YAML file and it has support to embed a bitmap in the final EFI entry
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SaaSHub
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mkinitcpio is an arch thing: https://github.com/archlinux/mkinitcpio
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Even for those using systemd-boot with custom efi drivers to provide functionality, it's worth noting that those drivers are being developed downstream of GRUB.
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