While Handscombe's been primarily used as a batsman throughout his Test career, he's also kept for Victoria at state-level, and gives Smith and Australian selectors an option if they want to shake things up.
There had been some doubt over whether Handscomb would make it to stumps though after he hunched over and needed to sit down before being attended to by team medical staff when on 64 late in the day.
Mushfiqur will resume on day two alongside Nasir Hossain, who was unbeaten on 19.
Former Australian cricketer Dean Jones battled the massive heat during Madras Test against India in 1986.
In brutal heat that Australia players have nearly universally declared the most oppressive they've played in, Warner struck just five boundaries on the way to his hundred. It was a very special day and hopefully they can kick on.
But Warner and Handscomb put their shoulders to the wheel and soon put Mushfiqur to the sword with a superb stand that Australia will hope has plenty left in it on day three. "The wicket did not have much turn like the Mirpur wicket". It will start to spin as the game goes on.
"He led the way in how we wanted to play in that partnership". In these conditions Patty felt the heat nice and early and so did I, but I thought we bowled OK to take six wickets on a pretty docile wicket.
"Obviously Bangladesh did that against us last week".
O'Keefe's elevation in place of Jackson Bird came as the Aussies opted for three spinners and only one specialist quick after losing Josh Hazlewood to injury.
He would fall not long afterwards with Australia still behind on the first innings to a sensational catch at short square leg by Imrul Kayes, who bunted the rapidly travelling ball upwards before juggling and completing finally snatching the pill.
"It's a good question". If he did it that way he probably couldn't bat as high.
Australia ended day two on 225/2 and will continue batting on Wednesday at 10:00 local time or 04:00 GMT.
When Agar had Shakib Al Hasan caught behind by Matthew Wade, the tourists were well on top but they were unable to build on that advantage.
Cricket Australia have reported that a window on the team bus was broken as it returned to the hotel on Monday in Chittagong, possibly by a rock or stone. The bus received minor damage and no one was hurt, with the projectile suspected to have been thrown by a child. "We can assure that there is no problem with security". Both security teams - ours and Bangladesh's - have been fantastic.