Today I fitted a Royal Enfield Interceptor 650 screen to my Himalayan. That screen is a really good option.
The brackets for the Interceptor are rather different to what is required for the Himalayan (different bikes, who'd have thunk it duh!) but Himalayan Tools offer brackets that will mount the 650 screen to your Himalayan.
This video shows one man's misadventures as he fits the 650 screen to his Himmy - actually, you'd be distressed to see how much has been edited out but I'm not going to air all my dirty laundry in public.
This video isn't a 'how to' - such a video would be rather shorter. This is just exploring and enjoying my journey and yes, the result was well worth it, both in looks and in effectiveness. This screen is a worthwhile modification to your Himalayan.
How? Rather than the turbulence from the standard screen, all you get is the hiss of the wind past your helmet. It is true that as you go faster you get more of a hiss, but it is still just the hiss of smooth air. Well worth the effort.
https://youtu.be/zkx60oRaxyE