I don't know, but if the rescue system provides QEMU you can install OpenBSD through QEMU. See L<http://wiki.hetzner.de/index.php/OpenBSD> for an example (in German). Note that you can put files into a RAM disk, e.g. /dev/shm on Debian instead of a temporary partition. Also, there's no need to use VNC if you enable QEMU's curses interface. Furthermore, I'd use softraid(4) instead of raid(4).
Alternatively, there is Yaifo, which worked very well for me. See L<http://erdelynet.com/?s=yaifo>.
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