If the theories about his tattoos are to be believed, then maybe a bucketfull of painkillers ( or some corrective surgery) would be high on his list!
I'm not convinved that he'd trade his footwear, as according to some, an Austrian firm bought the pattern and were selling replicas for a while (and doing quite well I'm led to believe).
I reckon he was quite comfortable with his normal clothing, but a rain cape or poncho would be a bonus, his grass cape would have had its limitations, but it must have been sufficiently effective to warrant it being taken on his final journey, over a skin or hide based garment.
I also think that the trouble with modern hunting tools is that you often need to purchase further things like ammunition to keep the tool performing, perhaps a fibre-glass bow, capable of shooting arrows that could be made on the trail, would be of greater benefit.
But, would the modern world allow him to carry on living his existence undisturbed or would he become a victim of 21st century curiosity.
ATB
Ogri the trog