The traffic managers will more often than not know nothing about the climb as the decision has been made tactically by the ATCO without reference. I can understand why it's done and that's to give the airline the best possible service, but sometimes the bigger picture is admitedly overlooked which can lead to potential problems for other sectors/units. I don't think there are many ATCO's who have not at some time been guilty of this.
There is only one way to ensure that conflicts like this do not arise and that is for pilots to conform to the their filed flight level and ALL ATCO's to do the same. Easier said than done I know !!
I don't believe that Eurocontrol condone or offer advice to this type of action as they are the ones who ultimately have to sort out the problems caused. IFPU/CFMU have their part to play in this and should enforce irregular flight planning more stringently.