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So it's basically what I would expect to get if I asked for a generic Bluetooth dongle.

Not quite, if your PC has a policy that disables Bluetooth, a BT dongle would not work either.

That’s where this relay comes in—it bridges Bluetooth to USB, so you can still use your devices.

This would also work to allow you to use a BT keyboard / mouse in UEFI setup etc I believe

I think it should, yes. I'm going to try as soon as I can find my raspberry pi buried in the garage.

It should work anywhere a USB keyboard works, realistically.

But that's exactly what I would want in the first place. Take my square and make it look like a circle (not a square with rounded corners).