You decided to go with the sixth option and remove the marked part of you soul.
You began by figuring out how much you needed to remove and found out, much to your relief, that you didn't need to remove much.
All you needed to do was shave of a very small part of it.
You steeled yourself, before starting to slowly cut off the marked section, clenching your teeth from the pain as you did so.
It was enough to almost make you black out but you kept going, unwilling to stop after already having gotten to this point.
The piece was finally seperated after several minutes and the pain stopped instantly, only to be replaced by an intense feeling of loss.
You watched the tiny shard of yourself as it floated aimlessly next to the rest of your soul.
There was an unwillingness to destroy it inside you, despite the fact that it had been marked with the image of a body you had grown to despise. You sighed and decided to give the piece it's own body.
You pushed it out of your body, letting it float into the middle of the room, before starting to gather mana around it.
The mana slowly condensed and you tried to give it a humanoid shape, only for it to snap back into a shapeless blob.
You were confused for a moment, before noticing that it was slowly forming a shape on its own.
It fluctuated too much at first for you to make out what it was becoming, but you soon recognized the shape.
The magic was forming the body of a cow.
You realized that the spell was using the soul mark as a blueprint for the new body.
There was nothing you could do but watch, as a body identical to the one you recently escaped began forming around the piece of you soul,
including all the alterations the farmer's wife had made, except for the piercings and the handles that had been glued to the horn-stumps.
You looked at her, unsure of what to do.