Dear Maintainer,

On installation of an architecture-appropriate efi-shell-XXX package,
please copy the shell into the EFI partition and configure grub2 to
have a boot menu entry to enter that shell.

I attach an example grup config file for aarch64, which works if
dropped into /etc/grub.d/35_efi-shell-aarch64 and the shell has been
installed as /boot/efi/EFI/tianocore/shellaa64.efi

The architecture test in the grub config file is probably not exactly
the best one; feel free to improve so that it works when running e.g.
an armfh or 32-bit arm Debian port on an aarch64-able machine.

For other architectures, adapt the architecture test. Maybe you can
generate the file for each architecture from a template where the only
change is the architecture test.

Let me second this request. In some cases the UEFI shell is the main and
the only tool to inspect the UEFI variables, DMI tables, etc. I think it
would be helpful to be able to boot it from the grub menu if it is
installed on the UEFI system.

In an attempt to move forward, I opened a draft merge request loosely
based on Lionel's patch:
<https://salsa.debian.org/qemu-team/edk2/-/merge_requests/15>

For now it is only a PoC limited to x64 and may be extended to other
platforms if it receives positive feedback from maintainers.