Try a classic cat-tongue nipple. You can still get them via Amazon. It might not be your thing, but it's worth trying.
That trackpoint + the good old thinkpad keyboard were, to me, the best experience ever. But thinkpad were always too hot, too big, and then they gave up on that amazing keyboard.
Perfect thinkpad: - 4:3 screen - arm-based - touchpad-less, grippy-trackpoint - old-keyboard
they clog up but with 500 of them and an ultrasonic cleaner I bet they last a long time.
I imagine you after a plague, or zombies, or war, in an enclave, 5 years later, panicking with only 2 spares left.