As someone who has used their phone and had a major accident on it with the phone mounted. I will never go with smart glasses, they were the first thing that I noticed was smashed up. My phone survived(mostly) despite the bike being a complete write off, that will happen when getting hit by a kayak at 50kmh.
I had a Quadlock mount and just their sticker mount on the phone, you can get cases for popular phones though. I now use a Garmin computer for my riding.