No way to answer your question without knowing where your hypothetical DCS hit occurred.
In many third world counties, where a lot of diving happens, the answer would likely be "sucks for you." If you can't pay, or even prove you can pay, for your medical care, you don't get any. That's a key reason for DAN insurance, even if your first world medical plan would cover you. With DAN, the chamber folks know they'll get paid. With your plan that they have never heard of and which exists in a country far away from them, they'll want cash up front.
As far as being unconscious, there's a reason why the dive op and/or your dive buddies should know that you have DAN coverage and how to get your DAN info.
I can tell you from my experience that some so called third-world countries and/or remote locations can be more prepared than one would think. It's not a guarantee that this will happen everywhere, but I will tell you I was bent almost 15 years ago in Cozumel. I received excellent healthcare service. Plus, I didn't have to pay anything bc I had my health insurance plan pick up the tab. Incidentally, I also had DAN insurance, which in this case paid nothing, since it is designed as a back up/secondary insurance. I should say that I was fortunate that the event occurred in a place where a Texas based worldwide network was operating. It's called SSS network. I think they have like a dozen chambers throughout the world. Mostly third world and remote locations, but giving first world care- and also doing all the insurance processing for free out their US office.