The first cable for PS2/Wii, I can't guarantee without testing it myself, but yes, it might work. Based on the resolutions it's claiming for PS3 and the fact that it has a "black and white video" output (that's probably just the luminance) it looks like it's taking the component output from those systems and transcoding it to RGB.
The second cable, I doubt that would work. It doesn't look like it has space anywhere for a transcoder circuit. You can't just change connector types, the colorspace has to be transcoded and sync pulled from the luminance.
With either of those you'd have to switch audio seperately. You'd need some custom cabling (DIY) to get the audio carried inside the VGA cables.
Just thinking this over, I think you'll be better off trying to find a passive component+audio switch if you're not up to making your own cabling. Also, while I could tell you how to handle the cabling for the PC and game systems, I don't have any experience with your media player so you'd be on your own for that.