You may get a lot of answers to this, but my method in an S76 is to put the pitot tube on the far edge of the helideck and keep it there. In a 412, I do close to the same, but I generally try to just be able to see the far side over the glareshield. I tend to sit higher than many other pilots, though, so this may not work for everyone. I suspect, from the seat adjustments I have to make when I follow other pilots into the aircraft, that many of them couldn't see the pitot tube at all.