Brilliant, BTW! I had never thought of editing commands in place with readline/inputrc. I constantly dropping in for loops by hand. No longer!

"\ef": '\C-a for i in $(\C-e) ; do \C-a \C-m'

For these to work, you'll need to enable your Option key as the meta key your terminal of choice. In Terminal.app, go to Preferences > Profiles > Use Option as Meta Key. In iTerm.app go to Preferences > Profiles > <profile> > Keys > Left option key acts as > Meta or +Esc.