The Bafang BBS units are designed as a retrofit to conventional bicycles. They are not designed to replace the drive units on e-bikes that already have a central crank drive (Bosch, Shimano Step etc). The Bafang requires a conventional bottom bracket shell (the bit of the frame that locate the pedal cranks and their axle).
So the answer is no! And the question is, why on earth would you want to do this anyway - it seems quite pointless? There's absolutely nothing special about the bicycle part of an e-bike. In fact, many of them are quite mediocre bicycles. Much better to get a good quality bicycle and then fit a Bafang kit if that's what you want. Maybe do some research so you understand what you are getting in to...
Sam.