I doubt that a newly qualified PPL could do it.
Why not? Here is a chap who flew around the world VFR in a homebuilt aircraft and having only 250 hours total at the commencement of the trip. A little bit more than a newbie PPL admittedly, but still.
Perth-Oshkosh
Oshkosh-Perth
Then there are the people of diverse backgrounds in a diverse range of aircraft types who participated in the 1969 and 2001 air races from the UK to Australia.
One thing all the people had in common was, no reward, no fame, only personal satisfaction. Save the race winner receiving a trophy.