I don't really care for the sound of
Calliope. It sounds like a good horse's name to me, not a person's name. But as for it being strange or off-putting to non-name-nerds, as long as you use
Callie as a nickname, I wouldn't worry about it. If I ever had another daughter, I'd love to name her Caledonia, and call her
Callie, so I can't really call you out on
Calliope.
I think
Calliope Evangeline/Evangelynn is too much of a mouthful and little pretentious. I'd try to find a simple one syllable name to go with
Calliope.
As for mispronunciations, just about any name can be mispronounced.
My name is
Janice. Common enough name, pretty simple, right? But telemarketers call me all the time and ask for Jan-ees, not Jan-is.
Do they think we're in
France? You can't always be worrying about ignorant people.