PS: Just seen that there are a number of family trees for this line on Ancestry. Mostly on what happened after they arrived in Australia. You need a subscription to view these on Ancestry.
Wow,

one of those has '187837 people in this member tree' .... and is private !

another has Samuel as convicted at age 7, and arriving in NSW in 1833, but the ship departing England in 1834 ...
I cannot see any tree with Samuel with first wife as Mary and then second wife as Janet, but then again, I cannot see any tree with much supporting documentation for Janet or her mum or sister ... perhaps the tree owners are being careful with what they post online ....
Anyway, I will pause my offline searchings through my Bowman records until I hear from our OP re that sighting of Samuel Beaman with a wife at Parramatta. I am fairly confident that would be the Samuel who had been transported in 1833, and had been assigned at that time to John EYRE at Parramatta.
http://adb.anu.edu.au/biography/eyre-john-2033 (missionary, school master, coroner etc)
JM