This hack is not limited to HP because ‘teeter-tottering’ may also be caused by warped keycaps.
Pretty sweet ideal! Personally I’ve been using small squares cut out of a sandwich baggie on top of the stab stems to make the keycap fit them tighter for this. Although they can still be “teeter tottered” if pressed on one side hard enough with my fix. Gonna have to get a pack of these & start replacing the plastic squares with them!