May not solve all your problems but Eurocontrol produce a series of large (1:3,000,000) "Central Flow Management Unit Charts (CFMU)" depicting sectorisation for both Upper and Lower airspace.
It does say on the legend however, that
"The sectors are shown for ATFM purposes and may not be as precise as the sector descriptions used by ATC."
www.eurocontrol.int/ais
[email protected]
RC