Not sure if you still looking for a windscreen?

It might be worth checking with Torque GT who are a JDM specialist based in Devon. They just ordered for me a carbon fibre bonnet and Saito 4 point roll bar for my Beat (both bulky awkward items) from Japan and were significantly cheaper than if I tried to ship it myself.

They buy a lot of cars and spares from Japan so I am guessing if anyone here in the UK can get you one and ship it over safely it might be them.