My wife accepts both but doesn't get excited about either.
My obsessions are guns and fast trucks. My wife is the same, doesn't mind my having them, but the interest to her is nil. But then I don't get excited about any of her hobbies either, except maybe cooking as well.
We do have hockey together, that's a plus. But I've gotten my wife more and more used to the idea of guns in our lives every day by little measures.
OP, use the news about break-ins, rapes, and murders to your advantage, not to scare her, but to explain that that is what you are striving to prevent. Impress upon her that she is important enough to you to want to protect her from the dregs of society. It's usually easier if you live in or near a troubled area. Sounds like she's open to the idea of guns, and that's a big plus. Do some shooting trips with the .22, so she can get better aquainted with guns in general, and give her a crack at the "man killer." Dollars to donuts she enjoys that too. Give her a year and I'll bet she wants one of her own. Then your trouble will have just begun. Whenever you buy a fine new firearm, she'll want to try it out. After that, it just might be "hers." Actually, that's a problem most of us would love to have.
Carrying at home, as was said, better prepares you for carrying on the street, gets you used to the weight, breaks in your new holsters, alerts you to their downfalls, snags, etc.