Giza was also Nemesis Prime's Arms Micron in the Japanese Prime toyline. It is a bit too easy a clue though, you're right.

The fact they mention armour has me doubting it's Doubledealer. Could very well be Astrotrain then. Has armour, transforms in 36 steps which is close enough and has 8 accessories (5 guns, 2 shoes and backpack). They could always give him an extra gun or something. Guess we'll find out soon enough.