My ex tried doing this and he ended up with one night a week which was Wednesday to Thursday.. because he was so unreasonable and was refusing everything I was suggesting, I offered more time in school holidays, I offered all sorts! But because it was me offering it he didn’t like it! It’s a way of taking control for them rather then thinking of what benefits there child, it was CAFCASS who came up with the Wednesday to Thursday due to his lack of cooperation and clear mind games, obviously they said it could be reviewed once our son started full time school.
the courts/Cafcass will see straight through his games. I would write down everything you possibly can (notes) of what you are putting forward for your child, come up with alternatives like you have done.. offer maybe an extra night during half terms/school hols.
they will see who is trying to make a structured and stable plan for there child and who is just doing things out of spite and nastiness.
my ex was extremely manipulative, as soon as things in that room wasn’t going “his way” rather than trying to see what was best for our son, his whole attitude towards the CAFCASS person changed, he got annoyed basically and his true colours came out because he wasn’t in control anymore! She even said to him “do you have a problem with your temper”..
they will always focus on what’s best for the child! You sound as though you’ve been more than reasonable and couldn’t do anymore than you have! He wants to play horrible spiteful games. It’s very unlikely they’ll grant him that day as you have good reason for needing the other day instead.. x