My wife Marlene's ggrandparents who were Fischer's also lived in the Milwaukee area (West Allis)around 1900. They came over from Germany.
Paul Fischer (18?? - 1930's) and his wife Louise Solomon (1866 - 1930's).
Paul and Louise had five daughters,
Agnes, who married Charles Van Kries - lived in Chicago.
Elsie, who married Gus Dresden.
Irma, who married James Smith (my wifes grandparents)- lived in Hilbert WI
Louise Fischer - never married.
Hellen Fischer, who married Fred Bieri - lived in Green Bay, WI
I don't know if there is any relationship, but at least it is another Fischer family off you list.