@Archangeliques,
Interesting ..... i've not heard or come across that approach before, at least on a MAC.
As far as I know ,I don't think there is any mechanism in WEG that you could use to achieve what you want.
It may be possible to inject a modified 2K or 4K monitor EDID but it's not something i've ever done myself.
SwitchResX usually works well on a Hackintosh so it's possible that the method used on real iMac's and MBP's may work for you. The only unknown would be your GTX 650 Ti as no Mac ever shipped with that GPU and you'll be relying on the Nvidia Web drivers to support what you want to do.
If you do get it to work please let us know how you did it, as i'm sure many other users would be interested in it.
Good Luck
Cheers
Jay