Instead of sunglasses, I've had an HJC Symax flip up face mask for about 9 years now (it's the helmet on the bike in my profile Picture) and have loved it. The shields (tinted or clear) can be replaced in about 20 seconds and aside from the shield itself being movable, the entire front face of the helmet rotates up and out of the way, great for being at prolonged stops, or when you just want more air. Flipped up it does add some wind drag, so you don't want to do it going 100+, but aside from that, just fine.
They still make the Symax, but the new line they call the IS-Max, meaning integrated sunshield. It has a normal shield, but inside, has a flip up/down sunshield as well as a full flip up front. I haven't tried one on as my Symax is still just fine, but when I do get a new one I'll be trying that IS-Max out.
I used to try to stuff sunglasses under the helmet but when I found that Symax, it seemed to fit the bill for me.
