Justin T
I certainly appreciate, even envy, your minimalist approach. Both of my grandfathers lived all their lives on their farms with both only owning one .22 rifle, and one 12ga shotgun.
I have only recently begun to appreciate the 9mm. I think i would sleep just fine while camping with it under my pillow. In fact, I would probably choose my 9mm out of all my handguns because it has a light mounted on it.
I have many guns, but many of them were inherited like yours.
Here is something for you to consider....
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I feel like your 9mm is easier to carry than either the 640 or the sp101.
While the .357 is a more powerful cartridge, you will give up capacity, ease of carrying reloads, better sights, sight radius, slim width, and familiarity.
I definitely wouldnt trade off i gun i like.