I found that if I put the Shoei on first without my glasses and then put the glasses on after the helmet is on, it's much easier than fighting with both the helmet and glasses at the same time.
I hear you about the Cobras. I tried my bike with Cobras, as the dealer had installed them on the bike before selling it. They lasted all of 10 minutes on my test ride before I insisted he put the stock pipes back on, which he gladly did in about 15 minutes. He was going to charge me his cost on the Cobras if I wanted them, but their droning was ridiculous. I'm very happy with the stock pipes.