When doing assigning you own fictional MAC I would recommend using locally administered addresses. It's basically just one bit flip: https://en.wikipedia.org/wiki/MAC_address#Universal_vs._loca...

  x2-xx-xx-xx-xx-xx
  x6-xx-xx-xx-xx-xx 
  (... etc)

And a question do you know why ap0 doesn't show up in you iw dev command? It seems you are only changing the addr not the device name.