looking at the clips on the headset and how the man used Velcro, i have an idea on how pimax might design the new head strap.
a lamp shape is a circle cylinder. the mod to this would be to cut the cylinder in half vertically.
this cylinder straight edges are attached to two pieces, one piece per side, the pieces on the cylinder are not movable.
on the headset are two pegs, one peg per side, and they are immovable.
the pieces on the cylinder are stuck to the pegs on the headset using Velcro.
also the pieces on the cylinder encase the peg on the headset so the headset isnt flimsy.
this way the cylinder can be at different parts of the peg for the left and right side, to suit unsymmetrical faces.
and on the back of the cylinder is a strap to keep the headset from falling off the head.
the cylinder might not fit on the head size so its split vertically down the middle and the two pieces of the cylinder are attached using another strap.