I agree with others earlier - Do you really need a 4x4?
Insisting on one restricts choice, increases costs and adds to the mechanical complexity.
Unless you are considering some 'extreme' routes you will be on tarmac or good, regularly graded, gravel roads throughout, other than possibly in the Stans and Mongolia (to where I have not been, although I 'strayed' across the theoretical border in a remote, trackless part of Tuva - according to our GPS trace and mobile network Welcome messages!).
Any, and I do mean ANY, car sensibly driven can cope with your route - and thousands do, day after day after day.
If considering lesser, unmade/dirt roads - again, normal (do we call them 2x4?) cars also drive them daily without problem other than possibly in bad weather conditions.
As you will find out, either in further research or on your trip, most of the World is not the 'adventure' it once was.
London to Brighton was a challenge once.
I regularly see travellers returning towards Europe who had a far easier (and less challenging) journey than they expected or prepared for.
However, they enjoyed their trips just as much - just not as anticipated.
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