I respect the craft, and I have riced my distro, but theming my boot loader is the last thing I would waste time on.
I use my motherboard F8 menu to switch between Win11 and Arch boot loaders (so they can ignore each other, much simpler to maintain), so systems-boot appears only exactly 3 seconds to give me an opportunity to boot Linux-LTS instead of the last kernel version.
And if I need to do anything fancy at boot time (eg: repair a borked boot config), I use a USB key with arch iso, and chroot into my install and then I have the full power of the command line.
I really really fail to see the point of spending hours to theme that.
I use my motherboard F8 menu to switch between Win11 and Arch boot loaders (so they can ignore each other, much simpler to maintain), so systems-boot appears only exactly 3 seconds to give me an opportunity to boot Linux-LTS instead of the last kernel version. And if I need to do anything fancy at boot time (eg: repair a borked boot config), I use a USB key with arch iso, and chroot into my install and then I have the full power of the command line.
I really really fail to see the point of spending hours to theme that.