Hi ggg - saw you on the 4 and more thread, so feel I know you
It sounds like a fab opportunity, as long as there is someone like a childminder, or a nursery that you trust for your little dd.
If the job is outside school hours then it should be fairly easy to see plenty of your school age children after work etc, and you can shop (blissfully guilt-free!) on your one day off a week.
My concern would be caring for the children if they are sick and can't go to school/nursery - you would then have to take time off (assuming no grandparents in France with you). Would work be cool with that?
Rereading your post, it sounds like your book needs a breath of fresh air from somewhere - could it be that a new job will give you a bit of vavavoom, and some tighter deadlines to work to? I know deadlines always work for me
Fascinating dilemma... Let us know how you are getting on!