A Halo band wouldn't be as portable. However you can make the Quest way more comfortable using a counterweight - I'm using 10,000 mAh battery attached to a cushion and it makes a big difference, as well as giving more play time. I've also added some padding to the top two straps using a modified removable headphone cushion.
I'd happily sacrifice portability if it made the device more comfortable!
I'd looked at the VRCover but the initial feedback is that it really doesn't improve comfort much. Likewise I don't want to add a counter weight to the back of the headset as I worry it could damage the plastic straps at the side side due to the weight/torsion.
Has anyone tried the head strap from :-
https://www.studioformcreative.com/product-page/go-quest-deluxe-strap-black