Isn't the centre bore smaller on the BMWs?
https://www.wheel-size.com/size/bmw/3-series/1990/
https://www.wheel-size.com/size/nissan/micra/2000/#trim-14i-eudm-80
So the BMW wheels wouldn't fit over the Micra's central locating... lip... thingy
Unless they were professionally machined out.
Love the car btw, I miss driving my 1.4