If somehow we could install the A6300 firmware on the A6000 it would have slog and would support pdaf for stills. Is it possible to trick the camera to take another camera's firmware?
That's very unlikely to happen: it's a different sensor and a different processor, if anybody tries the most likely result is that the camera will be bricked.
In any case, you do have pdaf for stills on the a6000, right? It's slog that's missing, and even if you get it the sensor will still be doing line-skipping.