As far as i know all me7.1 s4 ecus are the same or similar any bin file can be flashed to a s4 ecu.you can flash a mbox ecu with hbox file or a abox ecu with a mbox file its just a matter of swapping mafs for the correct file.Early s4 had bosch mafs and late ones had a hitachi maf.
Why don't you keep the maf and swap the MLHFM map instead? Would it be doable?