Note that the .pk3 files are just zips, so you can use winzip or whatever to open them. There should be an npc entry for kyle that will specify his saber colour. You can package it as a mod .pk3 and put it in a directory in GameData (I think? been a long time since I did this). Then you can load it from the mods screen in the game. Or put it in your GameData\base folder and it should load every time.
Again, that might be exactly right as it is from memory...