Not sure if this is helpful - looking at Michael SHANNON - his address on the passenger list is (I think) Main Bridge, Polmont.
1901 Census for Abercrombie Place, Polmont:
Michael Shannon 36, coke maker, b Ireland
Elizabeth Shannon 36, b Maravainde, Stirlingshire (Possibly poor transcription for Muiravonside)
Susan Shannon 6, b Falkirk
Elizabeth Shannon 2, b Polmont
I don't have access to many Scots records so can't find anything else useful about him.
Perhaps the connection is through his wife who was born close by.
no help in finding what happened to them in Australia though.
Judith