I know you prefer to not where glasses-mounted mirrors. I was the same way. I used to ride with bar mounted mirrors. I do a lot of distance riding and commuting and I did not like the fixed position of these mirrors.

At the suggestion of a fellow randoneur, I opted to try a Take A Look mirror. At first I found the mirror hanging out in front of me vision to be slightly nauseating. But I did like the fact that there were no vibrations and that I could scan the road behind me eliminating blind spots. I stuck with it and soon became adapted to using it. Now I don't even think about it. It is just there.

When out for a walk or jog, I do find myself looking for the mirror to see what is behind me. Maybe I should just have one permanently attached to my glasses at all times.