"He had a hell of a game," said Back.
"I imagine he'll be well in the running to start one, if not both [Australian] games."
Wanganui's Heartland hooker Cole Baldwin was also among the tryscorers, while loose forwards Bryn Hudson and Fraser Hammond continue to enjoy playing on that open Memorial Park track.
Halfback Lindsay Horrocks was exceptional, distributing well and willingly tackling Marist's 6ft tall Fijians front on.
On the Marist side of the equation, Wanganui's Simon Dibben saved some tries on the wing and made the chip-and-chase which led Marist getting a penalty try, while prop Viki Tofa played very well against his bigger opposites.
"We found our feet and really got going towards the end," said Hamlin. "They ticked all the boxes for everyone concerned. We wanted to validate the Marist thing and keep [McCrea Cup] going, and [Heartland] played a good game ahead of the Australian games. The ground seems to generate a lot of open rugby."
North Otago's Lemi Masoe also scored two tries for the Heartland team. The 23-man squad to face the Australians will be announced today.