Easily hacked door/contact sensor

Does anyone know of a door or contact sensor that is easily repurposed? I’m finally getting around to tying in my hardwire smoke detectors. I just need a dry contact sensor that I can close with a relay. A lot of the links I’ve seen on here are for sensors no longer in production.

FAQ: List of devices with dry contact input from external sources

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I have a bunch of these:
https://www.monoprice.com/product?p_id=38135
Very stable and work well. Like most contact sensors there is a magnetic reed switch that activates when a magnet is near. Hacking would be a simple matter of removing the reed switch and wiring in what ever contacts you want.

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