Greetings! I have actually researched and tried to achieve this. However, it is not possible to ADD upgrade slots to these armors (at least with my current understanding of DAI modding tools). I have created a mod which aims to balance schematics, and it includes these one-piece armors and weapons. To summarize, the mod will BUFF all armors and weapons which do not have upgrade slots, so they are as strong as the rest of the armors. You can find my mod here: https://www.nexusmods.com/dragonageinquisition/mods/1991?tab=description Enjoy!