By my own guesstimate 95% of tetra ends up in the bin.

It’s likely 80%+ and will stay that way until councils include it in their curbside recycling collection (some do) because it is either too much hassle.for most people to take to their local tip so they stick it in non-recyclable or they see the recycle sign and lob it into that bin where it gets extracted at the recycling centre and sent to landfill or incineration. It’s the same with “recycle in store” plastic.

Found this (Indonesia)

Making the whole carton into panels or pallets definitely seems the best way to go as it is less water and energy intensive and stops the polyaluminium from eventually ending up in landfill. It’s unclear how much of it ends up on that path.