The Kangaroos will face England in the final on Saturday night.
Brett Morris added his pair of tries to the total, Lockyer setting up both efforts, the first with a long pass and the second with a well-placed kick.
Gidley improved Morris’ second before Thurston added his first goal by converting Jennings’ hat-trick score.
France – 4
T: Elima (61)
Australia – 42
T: Jennings (22, 27, 56); Lewis (41); B. Morris (45, 50); J. Morris (67, 72)
G: Gidley (41, 50); Thurston (56, 67, 72)
Ref: Leon Williamson
The controversial split system will come in to force in Kingstone Press League 1 next season, should Toulouse join the competition as expected.
Hunslet Hawks produced one of the shocks of the season as they handed a surprise boost to their chances of avoiding relegation with a fine 41-24 Championship Shield victory over London Broncos at The Hive.
Former Leeds, Warrington and Wigan full-back Richard Mathers says he is exploring legal avenues after being handed a six month ban.