For EO I'd say try & pick up some african camo shirt & trousers, they pop up every now & again on ebay, or tropical DPM although OD BDU's would suffice. As for webbing say a Rhodesian or SA chest rig or assault vest OD or brown (nutria), for weapons best go for an AK or derivative. The kit I would say isn't that extravagant, keeps overheads down!
EO was most definitely a PMC, most current PSD's would I expect agree upon the difference, EO undertook offensive operations & military type missions against the rebel forces rather than simply protecting assets. (& a bloody good job they did of it too!)