Well, you seem to be on the right track except that you need a solenoid valve to make this viable. Instead of the servo, you fit a solenoid valve in series with the flush outlet; of course you have to remove the manual flush valve. This will work on a direct inlet pipe only. No cisterns here.
The other 'political' approach is to do what my little kids do. "If you don't flush, next time, I will not flush"
JF





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