Pedelec, 26 volt Panasonic unit Kalkhoff with the 24 Ah battery, still quite light, huge range potential and also easy to pedal even without power. Or negotiate buying one of the similar but very light BH-emotion models without the battery and buy the 24 Ah Kalkhoff battery for it separately.
Alternative hub motor bike, an eZee model from their range with their custom dual battery setup having similar capacity.