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OH! 12V 28BYJ-48 are not good choice as you will need at least 24V PSU to make them move with bipolar hack.
Otherwise you are right that 1/2 microstepping will be just fine. You will have 23264/50 = 81.92 microspteps per mm of movement in X and Y axis. But that will not have influence on overheating as that is dependent on the current you will set on drivers and speed of the motor you will use to move them.