I just received an Apple //c VGA adapter from Пламен Вайсилов, a prolific Apple II hardware creator. This adapter has a button that lets you switch between video modes: color, green, mono and mono-white. also simulates scanlines in all those modes. Check the video.
At the time of this post there has not been pricing and availability announced, keep checking Apple II heaven site. Also important to mention is that this is only NTSC, a PAL version is on the works.