this is a good option for cheap. Just adds more support to the existing head strap.
I ended up getting two of these for my quest 2 and my kids and i love it. It's cheap. It's flexible and won't break and it's comfortable for my big ol' head and my kids' heads.
https://www.amazon.com/gp/aw/d/B08V55VHMX?psc=1&ref=ppx_pop_mob_b_asin_title
Here's a link to the Amazon US listing
This has gotten good feedback and is 19 USD
There is a potential solution that might keep everything a little more secure. AMVR actually sells a back support piece similar to the elite strap. It's a little pricey but I think you can get off-brand Aliexpress ones for like 10 bucks.
I had one of those lying around after replacing my stock strap with the halo strap. Being a little curious, I went and secured the piece onto the halo strap's rear padding with some velcro. It ended up working really well and actually stopped a lot of the wobbling in my experience.
This might be something you can try if you really wanna use the halo strap. It kinda gives you the same type of comfort as the mod above but without the extra battery/counterweight.