Bethesda didnt' tell me if it was possible to modify the construction set to add additional slots (Biped Objects)
They just more or less ignored me on that accord.. I'll find out eventually though
Maybe Crossing the Morrowind/Oblivion Construction Set maybe? There are several things we'll need to find out though.
1. How the Construction Set was made
2. What Programming Language it uses
3. Where the Biped objects section is

EDIT:
There are mods which allow you to wear 10 rings instead of 2, I dont know where to find them, I haven't created them because I suck badly at modding.
However, you may want to make the clothing, and then make it take up one of the ring slots?.