Assuming that you are still speaking
May I suggest a practical approach?
Try explaining the practical consequences of not signing.
If he intends to 'defend' the divorce it will end up costing him money.
Most divorces are undefended for a reason as it allows for quick and cost efficient separation.
The court is not interested in the details (sometimes messy) of a divorce.
They are only concerned with the 'ground' irretrievable breakdown of a marriage.
So if he agrees that you should still divorce it's in his best interests to make it as simple as possible.
If he no longer agrees on divorcing that's a whole other post.
If it really is the content of your statement, explain that a undefended divorce is almost a procedural matter as far as the courts are concerned, that your statement was not intended to offend, its hard to judge what to include and what to leave out, but that practically if you have already submitted your application to the court/divorce centre the easiest way to resolve this is to sign the form.
Undefended divorces are not a matter of public record, so only the two of you and your respective solicitors will know what was in the application.
Hope this helps