That’s a good question. I’ve seen that the data that tells your game to deplete your Health in Super Saiyan Blue Kaioken is in the BCM and BAC files of your skill. When you import the skill directory, it specifically imports those files… Try converting the files into XML format and edit them with Notepad ++. You’d be looking for an entry that has a large ki requirement and additional data that seems different from the other entries that require fewer ki bars.
After your edit, don’t forget to select that folder again for your Skill files before you save and install the transformation skill.