Overseas trips are a totally different animal than one here in the US.
When I went to Africa on a safari I purchased both a trip insurance and evacuation policy as just in cases.
The trip insurance covered just the trip alone. Airline flight cancellations, hotels, and travel and that was it. The evacuation medical policy covered anything that happened to me while I was out in the bush which included air flights to the nearest high grade trauma center along with a med evac flight home to my local hospital if necessary.
But you have to figure that in Africa you might be a few hundred miles from the nearest medical care of any kind so it was well worth the cost of it.
Here in that states just the travel insurance would be worth it. Depending on the policy it may even include the cost of the hunt if for some medical reason you are unable to go. Usually just travel insurance doesn't cover anything medical and evacuations but that is something you would need to check on.
I would talk to my local insurance provider, they should be able to help you with what ever you decide to do.