For the DH convincing, presenting the at-home days when the child is already crying can get you into a corner, especially if the DH is going by "theory" or logic only (Formula A: never give into a child who is asking for something no matter what they whip out...which is correct parenting under "normal" circumstances).
If the DH is never in the midst of the drama it's hard to bring them out of the theory/logic mindset. This goes for morning as well as after school before the all the decompressing and destressing efforts turn the frazzled kid into a calm and presentable child hours later when daddy comes home!
Last year on one really bad morning (really poor teacher fit last year) I walked away from her and out of the house before I had a nervous breakdown, and left him to take her to school. His concern for his daughter and responsibility did kick in when left alone with her.
He was completely shattered after this one experience and was more open to the improving-things conversations after that.
The K homeschooling wasn't as hard to convince him because of how the school people acted at meetings...very unprofessional, not worth the effort at that young of an age.