For quick random use a hat is the best choise.
For hard core dudes maybe something like this, sideways it would be easy to use any kind of strap https://dashcamtalk.com/forum/threads/90-degree-or-sideways-conversion.6213/#post-113034
But it makes me wonder, with headband you will look like some 80's aerobic dancer of with baseball cap you will look like todays gangsta rapper, what will be your choise
With the wide angle lens you will have to space it out real good from the head, otherwise you will just have hald the footage filled with your ugle face.
The discontinued innovv C3 with the 90 degree lens and the headgear was almost perfect aside for the stiff wire between the camera and main unit.
X camera clipped to the brim of my cowboy hat.
You need IS or a more smother gate than mine to get good footage.
The burger run with the C3, in the mirror you can see it below my left ear.
And in the footage you can see my chin once in a while, and this is with a much narrower 90 degree lens.