This is not possible as you describe it, there is no savegame-editor or something like that.
You can however give the Ptolemies an army through the create_unit cheat. Look up the unit names in the export_desc_unit.txt, make sure the Ptolemies can have the unit you want to give them (if not it will CTD in battle) and then type something like that in the console:
create_unit Alexandria "hellenistic infantry thureophoroi"
for settlements or
create_unit "Euergetes Ptolemaios" "greek skirmisher peltastai"
create_unit "Captain Euergetes" "hellenistic infantry pantodapoi"
for characters.
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