Before he chose any of the modern tools, clothes or equipment, Oetzi would telephone his publicity agent and have him agree an Oetzi endorsement fee and arrange for photographers to be present..
He would probably just die of an illness that he has no immunity to - as do most people who encounter 'western' or 'modern' cultures. A prime example is that family who lived in the wilderness for years in Russia.
Alvin Toffler advanced the theory that the impact of the new on the person who had had no contact with modernity in his "Future Shock", 1970, would be almost more than they could bear but I always thought he was wrong. People can adapt almost instantly, as would Oetzi. Toffler refers to the Indian (North American, his usage) looking bereft into a store window and claimed that it was because the futuristic goods shown were outside his ken.
This was rubbish, the window shopper was not equipped by his economic position to take advantage of the goods on show and probably suffered various other sorts of discrimination. After all a totally unequipped baby can be a fully modern "electronic" citizen in, what?, three years.
There is a book called Hunting With the Bow and Arrow. It records the interaction between modern people and the last Yahi tribesman who had had no previous contact with westerners. It is practically this same situation. I'm pretty sure the book is available on the forum, but you can also get it here: http://woodtrekker.blogspot.com/2010/07/hunting-with-bow-and-arrow-by-saxton.html