This was the product.
https://www.amazon.com/gp/product/B0775YF36R/
I am sorry to say that I can’t remember the setup steps, but they were potentially as simple as plugging in the device and typing in the name you wanted to use to identify the computer over Bluetooth (this is only done initially, not each time you plug it in). I don’t remember any complications, but do remember being actively surprised (suspicious?) at how easy it was. I have a Librem 13 v4, results could vary on other computers. Anyone with a different product care to give it a try?
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