*finally* one of my mistaken purchases works out ... I bought a m.2 2230 NVMe stick for $18 last spring or so because I didn't realize it was keyed different than a m.2 2230 wifi slot. 😩 whoops.
well, it sat on the shelf, appreciated in value to over 3x what I paid for it, until (after making ANOTHER misguided purchase along the way, more on that in a sec) I decided to stick it in my laptop's m.2 2242 slot.
so I got an extender thingy, and that's when I found out that PCIe x4 NVMe sticks are M-key and the ancient x2 Optane stick that'd been in that slot was B+M-key and thus it still wouldn't fit 💀
soooo anyway I finally just received a B+M-key to M-key, 2230 to 2242 adapter widget, and now my laptop has 4x the swap it previously did (and the new drive is only 25% provisioned for the time being).
WHEW.