Peter, I actually discussed this very issue with Debbie Anderson late last week. She has raised the issue with TLG and with Coptic expert contacts. No answer has yet been received from these experts (i.e., off the tops of their heads, nobody seems to know what to do).
It is my feeling that any change by UTC at this point would be very ill-advised. We must wait for information to come back from these scholarly sources before proceeding with any proposed change. Meanwhile, I will see that your paper is forwarded to appropriate contacts. Rick