those keys can run up to about $400 to replace, depending on the manufacturer, and because it is not your key or car, I suggest you stop messing with trying to take it apart.
The only way is to break it. Then you will have to carry pliers to use the key while holding the fob next to the ignition switch.
I broke a key on my girlfriend’s car, only one key/fob, that is how I know. Replacement and second fob about $350 from a locksmith.
I fail to see why you are bothered by carrying the the around as is.
Carrying a FOB must be a bigger problem than I thought .
Also if this is the vehicle that was backed into while in a fast food drive through ( Next time park and walk in the excersise is good for you ) why are you paying for the rental ?
I just cut the plastic ring and then put them on a zip tie when I return them. Never had a problem. They kind of expect you to take them apart so you don’t lose both keys.
i own older vehicles a 2001 + 2011 + Dont like unnecessary modern tech so i steer clear of anything with TOO much tech + that = less problems $$$ in the long run IMO!!
I don’t see what cutting the plastic ring would do though. When I open the fob from that corner, it just exposes the battery. It doesn’t allow me to take the key out.