It should be possible to look at Mr Johnny's career plot and freeze his posting for the 2-3 years of the education phase or even bring a posting forward so that Johnny can start his education in a new school.
Bolleaux. There'd just be even more tactical brat-breeders planning their next spawn around plum postings - and some singly would get joe'd for the $hit posting instead.
Sprog status should be immaterial when postings are considered - CEA should compensate accordingly.