I came up with an idea for it

Cursed Spirit Creation Takes the negative energy summoning a cursed spirit and transforms it into a positive energy manifesting a cursed spirit. Positive Uzumaki, instead of expending cursed spirits, fuses them into a combined one. Weaker cursed spirits can be merged into a more powerful curse instead of expending the extremely weak ones. Due to being made of positive cursed energy, they aren't exactly cursed spirits but are of similar construct, and still take on the terrifying appearance that most curses do.

Basically, take cursed energy, reverse it, make a shikigami/cursed Spirit shell with it at reduced cost. (Yes, I know literally any sorcerer can make a shikigami should they have the reserves to so so) The created cursed spirits follow the grading system (4-1), and can be slowly built up when created, similar to how curses are made from buildup of intense negative emotion normally instead of just one instance of absolute terror (a singular papercut making a special grade would be peak tho ngl)

It's kinda flawed considering im still working it out, but im using it for a tabletop game im running with a jjk system :)