Cursed Technique: Soul Clip

I was thinking of the soul splitting katana. A katana that bypasses durability by cutting the soul. This doesn't make sense it's still a blade it can't cut past what the blade touches cutting through the soul so that the wounds it inflicts can't be healed. It only works if you're cut continues even though the blade stops, it has to already be able to bypass the durability of the cut for the effect to matter.

The curse technique: soul clip. You're body has to physically not be able to continue movement and your soul continues without it. So if you move into a wall your body stops at the wall, but you move your legs like your walking and your soul walks out your body and continues moving. It can do through anything without cursed energy and can take with it anything it holds that has cursed energy, so you can separate the soul from a cursed weapons physical form. Perception stays with the soul so ideally you restrain yourself before hand so you're not blindly walking into stuff.

The soul mimics the hosts movement with the exception of stopping on objects. So if you punch aiming for behind the target, like you should so you have power, your physical body stops in their armor but your soul hits their soul with a punch.

Your soul is invisible to anyone who can't perceive souls like Yuji or see what they can't see like Daido.

Downside, the things that was stopping the soul splitting katana from working isn't there to protect your soul, you don't have your body as "armor". A cursed weapon if it hits your soul will cut right through it and your can't heal soul damage with RCT so it's dangerous.