Trying to piece together a procedure that works : debootstrap and gpg keys?

Dear SPARCy folks :

     I am trying to do some testing of the kernel goodness posted
     by Adrian at :

         https://people.debian.org/~glaubitz/sparc64/

     However I have two ( or more ) slabs of hardware for this process
     and I wanted to begin with an older Netra X1 unit. This means I
     need a procedure to follow that is repeatable and actually results
     in something that boots and works.

     1) use the old wheezy netinst and netboot the Netra X1

         NOTE : The ORACLE s7-2 has USB ports which may work
                but I have not seen them work even once thus far.
                That is a problem for some other day.

         During the install of wheezy it will be necessary to drop
         into a shell and create this file :

         # cat /etc/apt/apt.conf.d/99unsecure
         Acquire::AllowInsecureRepositories true;
         Acquire::AllowDowngradeToInsecureRepositories true;
         APT::Get::AllowUnauthenticated true;

         That allows the use of packages wherein the GPG keys have long
         since expired.


     2) figure out how to use the old debian archive pkg repo to
        at least get a few workable tools. A key piece of the puzzle
        is debootstrap. I need to create a new "root" filesystem on
        another disk and fill it with the debootstrap results.

        I need the results from debootstrap in order to create the
        reasonable initramfs stuff with the modules from Adrian.

        This step is a show stopper.

        My notes on this claim something like so should work :

# debootstrap \
--keyring=/usr/share/keyrings/debian-ports-archive-keyring.gpg \
--include=debian-ports-archive-keyring,wget \
--arch=sparc64 unstable \
  /opt/sparc64/chroot http://ftp.ports.debian.org/debian-ports

# ls -l /usr/share/keyrings/
total 40
-rw-r--r-- 1 root root 26628 Jan  1  2015 debian-archive-keyring.gpg
-rw-r--r-- 1 root root 10601 Jan  1  2015 debian-archive-removed-keys.gpg
#

So then ... where does one find the GPG files needed for archive ?