Regarding John Wilson in Melbourne, Victoria.
After tracking down most John Wilsons on Sands&Mac Directory from 1905 to 1925, a particular one appeared at 465 Church street, Richmond, in the 1915 edition.
Unfortunately the editions have a 5 year gap between them.
This John Wilson was a coach builder. At the same address (465-467 Church st, Richmond) in 1905 and 1910 was J. W. George, or Johnney William George, a coach and lorry builder, blacksmith, and Councillor for Richmond Central Ward.
Apparently, J. W. George moved to larger premises in Church Street (549-551) 'now deep in Motor Trade', and leased the 465 address to John Wilson. At 467 Church Street there was another coach builder named Frank Andrewartha.
John Wilson advertised from 13 Feb 1913 to 27 April 1918, after that the address was in the name of another coach builder, Eli W. Day.
There are many references to J. W. George on Trove, his trade and political career reminded me of Isaiah.
Could this John Wilson be him? Hard to tell but the coincidence is interesting.
P.S. There were other 2 John Wilsons, coachbuilders, with addresses in Seville (31 mi) and Wedderburn (140 mi) from Melbourne, I haven't been able to track their stories yet. Councillor J. W. George went on 'a tour to England and other European countries, as well as the United States of America' in 1925.
P.P.S. Another interesting coincidence... Next door, at 464 Church Street, Richmond, there was a John Wilson, confectioner (1920, 1925), another possible source of inspiration for his fake name?