Here is a diversion for you while I try an pick my way through those facts and theories
Where are George's wife Georgina's roots ?
Although she signs 
 Georgina Done  on her marriage certificate the registrar's cross and ? pencil note give the clue that her birthname was spelt Dun(n)(e).
This combined with her age and her representation that  
her father was a Judge (more or less true) and came 
from Australia (not substantiated )with her Aunt a Mrs Giddens/Gittens has lead to a reasonably certain conclusion that she was actually born in Wellington.  
Her father appears to be one 
James Dunn a businessman and Justice of the Peace  partner in the firm of 
Bethune and Hunter.
James Dunn did not have a very good record with his women partners.
He married   Sarah Ann McMENAMIN (various spellings) in 1871
He was separated on grounds of cruelty and Sarah divorced him trial dated 24 Oct 1874
He produced a child with Mary C. GLEESON / DUNN / PRITCHARD (Georgina) born on 17 Apr 1875
James DUNN is well reported in
 papers past (thanks  

Mary GLEESON / DUNN / PRITCHARD is much harder to track down
Signal