FWIW debian/qemu-user-static.README.Debian

For What it's Worth:
In the file debian/qemu-user-static.README.Debian
is this text
* Configuring qemu-user-static to use in a foreign chroot
  When used with binfmt, qemu-user-ARCH-static can be configured to run
  a foreign chroot. The qemu-user-ARCH-static binary should be copied 
  (or better hard linked) into the chroot in /usr/bin. Then the chroot 
  can be entered and used like a normal chroot.

I haven't played with it, but it seems to help for "polystrap"


Cheers
Geert Stappers

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