Don't have any kids myself, but have watched with horror the situation in our family, where the mother has used every manipulation, legal and otherwise, to prevent their father from seeing the children, whilst she and her mother spread poison to them about their dad. The Dad is far from perfect, but the marriage broke down for other reasons - no third parties involved.
This has gone as far as her telling the school not to send their dad details of parent's evenings, school reports, exam results or anything else. (She works there!) This is despite legal orders to the contrary, but which don't seem to be enforceable. I begin to understand the "Dad protests."
vway, you have to reach a compromise somewhere, and surely the children's interests must come above those of your husband and yourself. It is a slippery slope you tread. You said that nobody knows you or what kind of mother you are, but you seem be giving out some vibes that indicate that you are seeing this as a revenge mechanism. I am sure you will say you are not, and it may not be your intention, but that is the perception you are creating - several posters have seen it as such.
I would just say make sure it is not your children who see it as that, as you may be the loser in the long run