binutils-multiarch is currently built with support for a hardcoded list
of triplets. I've changed this in Ubuntu to use --enable-targets=all
 and used the same for the new gdb-multiarch package, but this is a
bit painful as it causes some issues  and requires people to set the
gnutarget in gdb-mutliarch .
So I intend to change binutils-multiarch and gdb-multiarch to
--enable-targets=<all Debian-supported GNU triplets>.
But the first column of /usr/share/dpkg/archtable only covers triplets
suppored in Debian itself (not on debian-ports) and is documented as
being there for historical reasons only.
My current guess is to combine all GNU CPU names found in the second
column of /usr/share/dpkg/cputable with all the GNU names found in the
second column of /usr/share/dpkg/ostable, but that seems to be way more
than the real Debian + debian-ports.org ports which we support.
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