how to add user to "fuse" group?

[maybeway36]

I am making a live CD based on debian-live, and wanted to include
sshfs (for transferring large files over an ssh connection.) However,
this means the live CD user must be in the "fuse" group, and I haven't
found a way to make that happen automatically. I've tried
chroot_local-hooks and
chroot_local-includes/usr/share/initramfs-tools/scripts/99something,
but to no avail.