Thanks, guys. Good info.
I'll go the "destructive removal and trashing" route. No need to add these to my parts bins (except the screws).
It's good to know that I wasn't missing something obvious and that these couplers are in fact difficult to disassemble.
I'll never understand why Atlas O chose to put their precious resources into designing and producing these couplers when we already had a defacto industry standard and a range of choices within that standard with Kaydee. And to top it off several other excellent choices for those who want more scale fidelity than the Kadees offer.