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I doubt there would be room in the engine bay for two alternators and if there was the drive belt arrangement would need to be radically modified. Whilst it may be possible to fit a higher output alternator would the existing cables carry the extra load. You also have to consider that the battery would probably also need upgraded and would larger battery actually fit.
I think you would need to contact a specialist auto-spark - someone who works on specialist cars such as rally cars, etc. Maybe a specialist ICE could assist but be prepared to have plenty of money as such mods generally don't come cheap.
Currently in madnoel10's garage:
Honda Civic 1.4l