Woah, those are pricey but exactly what I’m looking for! I might have to bite the bullet and pick them up. Thanks!

This post made me try again to find a solution, and maybe a USB extension cord with a on/off switch could work. It’s not automated but would be more convenient than removing the dongle each time. I’m thinking something like this

I have this exact same problem, but with a Chevy bolt. Some cars USB ports are “always on” and some aren’t. Might be worth trying different ones and see if there’s a port that doesn’t power on randomly. This didn’t work on my car, but it’s a common solution I came across when I was trying to figure it out. For now, I’ve just reverted back to wired AA.

I’m the same, those dongles don’t last, and are annoying to use. I picked up one of these cables from aliexpress to use with my iems and it works a treat. There’s better quality cables out there, but for 10 bucks these are solid.