No that couldn't be useful. It only gets you in deeper trouble.
Illustrator saves two forks in a file: an SVG fork that is used if the file is opened or displaxed in some SVG editor and an AI fork that is used only in Illustrator. If you edit the SVG fork, you won't update the AI fork and you get a nightmare of a file, that contains two different versions of the contents. When you open it in Illustrator again and save it, the CVG edits are lost. Illustrator just doesn't take notice of them.
The SVG part of the file will always be RGB. Then AI part of the file might also be CMYK. Illustrator cannot save CMYK SVG (which would be possible with some trickery, but not inside Illustrator).