Stick Nuggers or Pushers are an option as is the over rotation warning system.
I believe the FAA don't allow Pushers though, as I worked on a couple of ANA classics that had been sold and were to be re registered under the FAA, Nxxxxx.
We had to remove the Pushers and a number of other Items, even the fake leather on the staircase handrails, we were told all items being removed were an FAA requirement, then their inspectors came along and checked all the paperwork before giving it a new registration.
It seeems strange not to allow pushers does anyone know of any FAA registered A/C with a pusher.