Hi Ashley,
The Aqara vibration sensor will get the job done. The so called “earthquake” was required on standard sensitivity. The sensitivity however can be set to higher (as described here). The battery life of the CR# battery is claimed at around two years. Once the sensor is paired with you zigbee stick, HA can use the sensor to trigger your automation.
As a proof of concept I taped an aqara vibration sensor with sensitivity = 1 to my office chair (vertically) and sat down on it. This triggered an automation that sends a message to my phone.
I uploaded a demo on WeTransfer:
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