What daox said. It's possible but it'd likely be cheaper and way easier just to sell and buy what you want.
You'd need a new flywheel,transmission(obviously),possibly cv axles,shifter,shifter cable,cvt control module,entire under hood and under dash wiring harness(from similarly optioned car of same year),radiator is different for cvt cars. There's probably a lot more stuff that's different too.
It'd be easier to just buy a wreck and swap everything over. If you found a great deal on one and have endless amounts of time to waste go for it.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)