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Just a cross reference that Ringwood was the right property. In 1912 the Beckitt’s  announced the birth of a son at Ringwood - https://trove.nla.gov.au/newspaper/article/10257422?searchTerm=Ringwood%2C%20Forcett The mother was Martha Francesca - https://librariestas.ent.sirsidynix.net.au/client/en_AU/names/search/detailnonmodal/ent:$002f$002fNAME_INDEXES$002f0$002fNAME_INDEXES:2107102/ada?qu=Beckitt&qf=NI_INDEX%09Record+type%09Births%09Births&qf=PUBDATE%09Year%091910-1921%091910-1921&d=ent%3A%2F%2FNAME_INDEXES%2F0%2FNAME_INDEXES%3A2107102%7ENAME_INDEXES%7E0&h=8 and her name is all over the lands titles deeds?

On the County land grant map layer on thelist map I've outlined in red the likely 200 acres that the Vernon's purchased

As a born and bred and still current resident of the New Norfolk district I can say the surnames Hay, Bradshaw and Eiszle were well established family names even in the 1910's and unlikely to be used as alias' or pseudonyms. Everyone knew everyone...

If it was Mr A Russell mentioned in the June 1911 Bryn Estyn fire article it was perhaps Albert John Henry Russell who had a son Kenneth born in 1909 and might have been the child got out by his wife Elsie -  https://libraries.tas.gov.au/Digital/RGD33-4-28/D9ADEE3C-FE77-4C57-A71E-7212DDC65BB (his brother Keith was born at Bryn Estyn in 1913 - https://libraries.tas.gov.au/Record/NamesIndex/2112501)

Lots of families passing through the district in that time period for seasonal work be it for hop tying, hop picking, small fruit picking you name it. Isaiah and Christina may have been such and perhaps were staying with one of the families mentioned in the fire articles but not necessarily getting a mention in papered articles...   

Another possibility though probably stretching?? There was a Catherine Elizabeth Hughes born in 1850 at Carnarvon (old name for Caernarfon in Caernarfonshire, Wales https://en.wikipedia.org/wiki/Caernarfonshire) Arthur's death certificate said he was born in Wales and his father was Robert, a soldier?

The Catherine Elizabeth Matthews who died in 1929 would have been born circa 1851? Could there have been some legitimacy to the claim of being born in Wales? There were certainly British Regiments going through Caernarfon in the 1850's? Even stationed there?

As I say long shooting but another thought??

The other Catherine Curtis marriage that peaked my interest was the in 1878 to John Matthews -

Registration Number 1259/1878
Groom's Family Name MATTHEWS
Groom's Given Name(s) JOHN
Bride's Family Name(s) CURTIS
Bride's Given Name(s) CATHERINE
District Sydney

Funeral notice for Catherine Matthews appears in the newspaper in 1929 -

https://trove.nla.gov.au/newspaper/article/16522061?searchTerm=matthews

Sydney Morning Herald 6 Jan. 1929

MATTHEWS.-The Relatives and Friends of Mr. JOHN MATTHEWS are kindly Invited to attend
the Funeral of his late beloved WIFE, Catherine Elizabeth; to leave her late residence, 11 Mount-street,
Pyrmont, THIS TUESDAY, at 1 p.m., for Church of England Cemetery, Rookwood, via Mortuary Station.

NSW death index gives little info -

Name MATTHEWS CATHERINE E
Registration Number 63/1929
Father's Given Name(s) 78 YEARS SYDNEY
Mother's Given Name(s)
District SYDNEY

Find A Grave -

https://www.findagrave.com/memorial/189180116/catherine-matthews

I'm not certain what details would be in the 1878 marriage certificate? Some sources says details can be hit and miss in these 1860-1870s certificates? If it contained her birth place and parents then might be well on the way to solving Arthur John Hughes origins?