I have swapped the otor from 2824 to 2836, which is basically the same mvt +/- the day function... I also swapped a rotor from a rado/eta 2783 to a eta 2836.
however I think the 2892is based upon a eterna design, and has a special rotor bearing..? might not fit the "normal eta" gear, also I think the 2892 has a lighter rotor, too light for the 2824.
anyway, if I was you, I might carefully carefully try and see if it would fit, but that still doesn't mean that the weight is right