EB's MoT is vanilla's Marian reforms. In order to designate a unit as the post-reform bodyguards you need to edit export_descr_units.txt (EDU). Find the unit's entry in the EDU and then add upgraded_general_unit* to the attributes line.
*I am not 100% sure that this is the correct tag, BTW. Search for another upgraded bodyguard unit, and check their attributes line to find the correct one. Also keep in mind that the A.I. apparently does not recruit units tagged as generals, and that you have to pay the unit upkeep in addition to the 200 mnai wages per family member; hence all EB bodyguard units have zero upkeep.
Don't forget to make a back-up of the EDU file before you start modding, and make sure you edit the correct EDU file.
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