Draft: qemu (>= 1:8.0~rc4+dfsg-2) provides symlinks for qemu-system-${debarch}
See this thread for context: https://lists.debian.org/eaa38414-d78c-8b69-5835-8613b5676820@msgid.tls.msk.ru
Using the symlinks provided by qemu 1:8.0~rc4+dfsg-2, autopkgtest no longer needs to carry an architecture mapping but can rely on qemu providing the mapping itself.
A problem is, that autopkgtest only Suggests
the qemu-system package so it's not possible to enforce a minimal version constraint.