1. Court or Consent orders aren't just a one or two year period, they span until the child is 18 years old. So for example, while your 2 and a half year old isnt much for a chat right now, one day she will be and you guys have no fall back provision.
2. Even though they are by consent they still have to be approved by a judge and if the judge doesnt see it as being in the best interests of the child they wont go through,
3. If you are moving these past a parenting plan into consent orders, they have to be witnessed by a JP at the least. They will tell your ex to seek legal advice, any decent legal advice will tell him not to sign that. If he doesn't seek legal advice but you and your lawyer don't stress to him over and over numerous times to seek legal advice then he may have recourse to have them changed in the future anyway.