I've created two CWC cheats to insert the specific items awarded by the Japanese Zeroshiki demo and the Square Enix Members referral program directly into your inventory:
Cheats
_S NPJH-50443
_G Final Fantasy: Type-0
_C0 Zeroshiki Demo Rewards
_L 0x20424320 0x0001D0D6
_L 0x40423F5C 0x000E0001
_L 0x0001B07F 0x00000001
_C0 SE Members Referral Rewards
_L 0x2042431C 0x0001D0D5
_L 0x20423F94 0x0001B08D
_L 0x2042420C 0x0001D091
Usage
To bypass Type-0's anti-cheat protection, you need to activate the cheats while viewing the save menu, save your game, disable the cheats, and reload your save. The rewards will be inserted towards the bottom of your inventory in order to prevent them from overwriting other items; an automatic sort will put everything back in order.
Zeroshiki Demo Rewards: All Summer Uniforms, Growth Egg
Zeroshiki is the second Japanese demo for Final Fantasy Type-0, featuring the game's prologue. Players start the demo with all 14 Summer Uniform key items and a Growth Egg accessory in their inventory, which carry over into the full game.
SE Members Referral Rewards: Mog's Amulet, Dress Uniform, Seydlitz
Players who register their game through the Square Enix Members Site can gain three special rewards by referring new players to the game's Zeroshiki demo. The first referral will award a Mog's Amulet accessory, the second will award the Dress Uniform key item, and the third will award a Seydlitz accessory.
Note: This only places the uniform key items properly into your inventory. You'll still need to use the previous "Unlock All Uniforms" cheat to enable them in the equip menu.