Nis, don't suppose you've got any pictures of the washer jet wiper blades?
I've been considering smoothing my bonnet, but the only place i could see suitable for the jets is the scuttle panel, can't see how the pipe could be routed to the washer jets if they're on the wipers themselves?
washet jets on the wipers work better because the spray down the lenght of the wiper, the pipes route up the wiper arm.
here's a link to a landrover fitting guide
http://www.reedx.net/landrover/mods/wipers/index.htm