For a champion infantry unit, or an upgraded troop of the Machiamoi, I suggest to add in the Kleruchoi. The Kleruchoi (or Cleruchs) were foreign military settlers mostly of Greek and Macedonian origin that are given their own land, and are ensured to provide the military manpower when needed. At first Machiamoi and the Kleruchoi were to differentiate on who was Egyptian, and who was Greek, but overtime it was to classify by financial state. The Kleruchoi were always wealthy from the start, and they were able to afford their own equipment and land, so I propose that they are made to be an elite infantry unit.