It may be usefull for you StalkerGB, i own OA without AA2. I downloaded your 3 Rifle Mod and put it into the addon-Folder. It is in Editor not under Bluefor nor opfor, its under empty(? i own german version) and then there are your units( same with 3 Para btw.) If i put then a soldier( for example At-Soldier) it say: No entry bin\config.bin/Cfg Vehicles/STKR_BritMTP.At.simulatin.
only Addon which works currently is the Multicam SF Addon.
Edit: downloaded the patch for OA and now the3 Para+ 3 rifle are playable under Blufor. Only missing thing are the uk weapon boxes( units got british weapons exept m249)