Yubico has another decive the Nano. It is designed with a switch instead of a button. I am almost sure that you could tie a string around it and then you could maybe pull that somehow, connect it to something mechanical or something.
Mmmhh, why not test this ...
... I have just tried this out. I used the wires from an old headphone and tied it to the trigger. I can Trigger the single click by pulling on the wire. I even managed to trigger the long click, but that was not very practical. I tried pulling it with my mouth, but since you don't need that much force, maybe connect to headphones or something would be enough. My laptop was constantly shifting about, but maybe if you have setup where the computer is fixed, that might be less of a problem.
You can configure the static password on Slot 1 (single click) and you can still use U2F if you like (You can even login with U2F and use Slot 1 for something else as well).
I don't know what your setup is, but that's the idea that jumped to my head. Sorry if it is stupid.
Mmmhh, why not test this ...
... I have just tried this out. I used the wires from an old headphone and tied it to the trigger. I can Trigger the single click by pulling on the wire. I even managed to trigger the long click, but that was not very practical. I tried pulling it with my mouth, but since you don't need that much force, maybe connect to headphones or something would be enough. My laptop was constantly shifting about, but maybe if you have setup where the computer is fixed, that might be less of a problem.
You can configure the static password on Slot 1 (single click) and you can still use U2F if you like (You can even login with U2F and use Slot 1 for something else as well).
I don't know what your setup is, but that's the idea that jumped to my head. Sorry if it is stupid.