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And then when the driver accidentally hits the button and needs to go back?

Notice how we're now adding more complexity now anyway though...

> Set a minimum time until next stop can be announced

This feels like a dangerous hack that will come back to bite you in any number of unexpected scenarios that probably occur frequently during an average bus driver's day.

Consider a bus stuck in traffic. It is not unusual, at least in London, for a driver to open/close the door multiple times between stops when traffic moves slowly enough, often with longer intervals in between than there usually would be between stops.

RFID like chips on bus stops too, maybe?

While active RFID is possible, other radio tech designed to work as beacons is more likely