Convert CMYK process to RGB spot

I'm a relative novice when it comes to scripting, so I've been trying to scrape together the code I need from here and other sources but it isn't quite doing what I want it to do.

I have CMYK icon files that contain 2 global swatches I need to convert to RGB and change the colour values, whilst also converting to spot colours from process. Lastly, I need to rename the 2 swatches. One script I have started is;

var docRef = activeDocument; 

     app.executeMenuCommand('doc-color-rgb');

var currentSwatchColor = docRef.swatches['CMYK Colour One'].color.spot.color;

     currentSwatchColor.red = parseInt(20);

     currentSwatchColor.green = parseInt(20);

     currentSwatchColor.blue = parseInt(20);

     currentSwatchColor.colorType = ColorModel.SPOT;

     currentSwatchColor.spotKind = SpotColorKind.SPOTRGB;

This changes the CMYK colour swatch to the specific RGB I need but doesn't make it a spot.

To rename the swatches I have;

for (var i = 0; i < documents.length; i++) {

for (var myCounter = 0; myCounter < docRef.spots.length; myCounter++) {

        docRef.spots[myCounter].locked = false;

        docRef.spots[myCounter].name = docRef.spots[myCounter].name.split('CMYK Colour One').join('RGB Colour One');

         }

}

The above works to rename the swatch but I'm guessing it's not the most simple or elegant way to do it - I found it elsewhere and it works.

One thing I haven't been able to find a solution to is renaming the existing filename, going from "CMYK XXX" to "RGB XXX" in the same file location.

Any help would be much appreciated!