I'm late coming onto this thread, but I'm not too sure what cwah is going to achieve, apart from undoing the freewheel....
As already said, a Cyclo (or similar) deep freewheel socket with 12mm+ clearance and enough leverage will remove a multi or singlespeed freewheel. You can fit another one up to 9spd (Sunrace) or S/S (but may have chainline problems).
Also mentioned early in the thread, changing to a modern freehub and cassette means changing to a dedicated electric hub. More versatile, but not so cheap...