Welcome to FT. Another Ozzie on board ^
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A *ONE4 would be a good choice (20 segments allowable).
QF web site The train EU to Asia is allowed in the fare rules. From QF web site:-
Transoceanic surface sectors are not permitted. Exception: for travel originating in South West Pacific, one transoceanic surface sector is permitted. An example of a transoceanic surface sector is when you do a cruise in place of a flight at your own expense.
Your transoceanic surface sector would be Eu to Asia