For a closer mirror, the Take-a-Look and similar eyeglass or helmet-mounted mirrors would probably work well. Personally, I don't like helmet mounted mirrors because they don't stay in place and they invariably get broken when I take my helmet off. And I don't wear sunglasses at night, so the glasses-mounted ones are out for me.

I don't see how the hand mirror you linked to would be any closer than a mirror mounted under the grip.

ATMO, that hand mirror seems like a lousy design. I move my hands around a lot during a ride, so I'd have to constrain that movement in order to keep my rear view aligned. How would you look in the mirror when signalling, shifting, or drinking a water bottle?