I posted a thread about some suggestions and this was one of the things I was touching on. How about a way to 'confuse', 'scramble', or shorten the effectiveness of the nme radar? Like 'window' for example used by the British late in the war, or the other method they used to shorten the effectiveness of German radar on the route to Berlin using matching wavelengths (?). There could be a loadout in a mosquito or other aircraft that has 'radar jamming' capabilities or something.
I feel the pain for the under-dar raid, but agree with hammer on the lookout thing.
Just brainstorming...
--dc.