I don't see any point in converting to a .22, just don't get it. How is shooting something with no recoil going to help you in a SHTF situation shooting JHP carry ammo?
You have much to learn Grasshopper.
When I was a semi serious action shooter (IPSC, Steel, and Bowling pins) I shot about 10,000 rounds of 45 acp a year. I also shot about 25,000 rounds of .22 rim fire through my 1911 .22 conversions a year.
Later when I became a Deputy Sheriff I really learned the trigger of my Glock 22 (40S&W), from a .22 Glock conversion.
Using either your 442, or a .22 rim fire 43C would help you/her learn her draw, acquiring sight picture and trigger control. A .22 conversion with little or no recoil really lets you know when you are flinching, or jerking the trigger, because recoil doesn't cover it up.
And most importantly to me, I can afford to shoot ten's of thousands of rounds of .22 rim fire, where I can not the center fire rounds. Or I've become too lazy to spend the time at the reloading bench.
I suppose if I had the money, I'd just have bought all factory 45 acp and 40 S&W, and not bothered with the .22 conversions. Though I do see where the 22's have their own benefit.
Interestingly Jeff Cooper wrote about the S&W 317 as having use as a self defense weapon because they are so light and easy to carry. That comes from a man who routinely called the .223/5.56 a poodle shooter. A 43C is a full ¼ pound lighter than a 442. Thanks to your thread I ordered one.
And if your curious, my carry guns today, like a lot of days, were a 442 in my front pocket, and a Glock 26 in a strong side vertical scabbard. I'm not a mouse gun fan, and have never owned a small pocket auto.
The heavier steel guns you mentioned make no more sense than the lighter .22 by your way of thinking. Perhaps keep an open mind. I do like your idea of just buying more 442's. I own two. One that went through Gunsight's Gunsmithy and bears a Raven on the side plate. I own no internal lock S&W's.
Emory