Maybe you could do it when the user logs on for the first time.
Try this it should give you the text installer.
NB this config script is for veriosn 3.x of Live-build.
#!/bin/sh
set -e
_DISTRIBUTION="wheezy"
_ARCHITECTURES="amd64"
_LINUX_FLAVOURS="amd64"
_ARCHIVE_AREAS="main contrib non-free"
_SOURCE="false"
lb config noauto \
--mode debian \
--distribution "${_DISTRIBUTION}" \
--debian-installer live \
--architectures "${_ARCHITECTURES}" \
--linux-flavours "${_LINUX_FLAVOURS}" \
--apt-recommends false \
--apt-options "--yes --no-install-recommends" \
--apt-secure true \
--apt-indices false \
--apt-source-archives false \
--archive-areas "${_ARCHIVE_AREAS}" \
--parent-mirror-bootstrap "${_MIRROR_BINARY}" \
--mirror-bootstrap "${_MIRROR_BINARY}" \
--parent-mirror-binary "${_MIRROR_BINARY}" \
--mirror-binary "${_MIRROR_BINARY}" \
--security false \
--updates false \
--memtest none \
--win32-loader false \
--debug \
--verbose \
"${@}"