THIS=alias2
FN=$TMPDIR/$THIS.script

cat > $FN <<'EOF'
#
(echo "$1")
EOF
chmod u+x $FN

shopt -s expand_aliases

alias foo1='$FN one; source $FN two; source $FN three; $FN four'

alias foo2='$FN one
source $FN two
source $FN three
$FN four'

foo1
foo2

rm -f $FN