Make Nomad's Medallion Evolve Into Any Max GI Items
I begrudgingly had to admit that the Ancient Coin Line is the bar-none best option to start with as support. As a result I've just been keeping it 
for until I'm ready to buy 
as maybe a 4th item. At a certain point, I just sell it when I want the 6th item and I have enough money.
To that end, why not make Medallion the base for all possible options of the final-form GI items? We could see out max gold at the end of the game, and we could have more flexibility at the time of the upgrade.