Revising the letter צ
In Ktav בית יוסף the right hand head of the letter צ is a Yod looking forward. In Ktav הארי this head is looking backwards. In ancient writings this head looks like the letter ז so it has protrusions both forward and backwards.I have a few mezuzot בית יוסף in which I want to add some ink and make the letters צ look like in the ancient writings. Is it allowed? Or, is there a problem of שלא כסדרן ?