Starting your carbonation at 60F and then going to 40F will work fine. About 60% as much CO2 dissolves at 60F compared to 40F.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk