I have done most of my European touring while wearing a Bell Moto 6 motocross helmet and Scott goggles with a 'half mask' which fills the gap between goggle frame and helmet,protecting the nose and upper cheeks.
I find it ideal..it fits me absolutely perfectly...it`s nice and light..the ventilation can`t be bettered...the liner is easily removed/washed/dried/refitted...the peak not only helps when heading into sun,but when it`s raining if I slightly lower my head the spray comes off the top lip of the GS screen and over the top of the helmet peak without going on the goggles.
As above,in cold weather I just tape over the vents.
It`s a noisy helmet but it is after all an off road race helmet,so I just wear earplugs (advisable anyway).
The goggles have antifog lens coating and never give any trouble.
One noticeable benefit is that I never feel that 'eyeball rolling about to nod off' drowsyness that occurs wearing 'normal' full face helmets on long days and in warm weather,due no doubt to all the fresh air I get.