Regardless, it’s incorrect and unfair to define subrogation as “suing”. Order of determination is basic insurance stuff and it’s certainly something the insurer takes into consideration when they underwrite a property like windurra.
That you don’t like it doesn’t change the fact that it’s already baked into the process and will continue to be no matter what your thoughts on the matter are. Also if it’s a significant enough claim, the gig is already up. It’s not like it will be a mystery as to what the origin point of the ambulance ride is, as well as any treating notes by the EMT/treating physicians. That’s going to be part of the claim and treated as a subrogation matter even if you perjure yourself when responding to the legally required COB/subrogation notice.
I have no dog in this fight, but this might be an issue where you are better off being more informed than you previously were.