Used the stock toilet flush botton for near a decade and suddenly decided it's just too short and hard to press, so I made it “better”.
And yes. That's a chopstick. Cut it to required length. And the “piston” is glued to that chopstick shaft. It's been 3 months and it's working perfectly, so I guess it can be considered durable.
The stock one does provide big/small flush options, but I've never needed to flush “big”. The one I made can only flush “small”.
The author marked this model as their own original creation.