It is interesting to note with that 1919 Electoral Roll sighting, Judith, that the Federal Election was held late December of that year and so the roll prepared and ready prior to that day.
On his WW2 enlistment, Charles gives his marriage date as 24 December 1919.
(wrong bride not withstanding!)
So, we do not see Minnie with him on the roll at this point.
She can be seen with her own family at home in Geelong.
(Details available if you need them , Victoria)
Sue