It is a pain and I'm sorry to hear that it will put you out as a working family. However can I just add that when DD started this september she did not do full days until the week before half term!!
We both work and I could not take leave as I teach 4 days a week. So basically we had a mis-match of friends and family members who did one day each a week for 6 looonngg weeks, with me doing my day off.
I did consider leaving her at nursery for a month but we didn't think that was the right thing to do as she would have missed the start and all the induction.
Despite all of this organisational chaos I still appreciated the fact that she was only 4 and it was the right thing for her to have a proper induction period. Yes, she was used to longer days at nursery but a day at proper school is vastly different, there is so many new routines to get used to, mysterious things like 'assembly' and 'PE' stuff they know nothing about.
The school wanted her to do a mixture of mornings and afternoons (they split the class in half or something??) initially but I wrote them a very nice letter outlining my difficulties and they agreed for her to do mornings only.
Anyhow, although it was a total PITA at the time and DH used over about a weeks leave in total I still think it was worth it in the end.
Can you take some unpaid leave between you? You are entitled to a certain number of days iirc.