If I write to the AD2S1210 read only register ...

There is a consultation.
My customer is working on a design using the AD2S1210.
But he did not get enough PCB status.
He decided to use the AD2S1210's / WR line in duplicate.

Here is the point of consultation.
If he writes to Position Resister (Read only in the data sheet) in normal mode, will something bad happen?
We expect the AD2S1210 to work without problems.
We need the knowledge of your engineers.

Best regards