> titanium out of the scrap bin. (Yes, I know that it will be nearly impossibly to cut off in an emergency,

Most commercial grades of Titanium can be cut with common tools. The tools will dull faster, but it's not impossible.

I suspect a lot of the stories about Ti rings being impossible to cut are coming from people who confuse Titanium with Tungsten. People get exotic metals mixed up all the time.

On the other hand, if you pulled it from the scrap bin you may have gotten some extreme aerospace grade of Titanium that really is difficult to cut.