For WinUAE 2.3.3: select a A1200 quickstart config, enable bilinear filter, enable PAL filter, set 16:9 aspect correction, enable integer scalling and set the following fields:
Hor. Size: -999
Vert. Size: -512
Hor. Pos.: -6
Vert. Size: 16
If you try to save the config now, WinUAE may crash. Your config file will be corrupted... At least on my computer it is.
PS. Sorry I forgot to submit the data.