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No, 12V version of this motor is useless for the bipolar hack. When you join the 12V coils You need more than twice the voltage to overcome the inductance. As I recal, Sobo84 already tried and was not succesfull.
This is questionable. When you join two Nema 17 motors in paralel on one stepper driver (typical setup of double Z-axis on many printers) you instantly limit the maximal RPM you can achieve (in my case to roughly 300-360RPM instead of 600-720RPM of single motor setup). You can connect them in series to keep RPM but that again they require higher voltage... 28BYJ-48 are already so slow, that paralel setup can still do only 15RPM as is also recommended for sigle motor. But one motor can sometimes do even 20-25RPM if you are lucky (although this is not granted). So you will not loose much but not gain anything either.