Make people strike two loose wires together to close the contact instead of a button :D
I'm using a SmartThings IM6001-BTP01 (zigbee) to do this. Works well. Has been in operation for about 12 months.
Since this is pretty straight forward, I think most any “single click” Zwave switch would work? I love IKEAs stuff but I think it’s mostly Zigbee.
I've seen a few people use an Aqara button
I'm using a zigbee button and it works great, no issues with the device over the winter, though I probably change the battery more than if it was indoors. I would link to the one I'm using, but apparently it is no longer for sale.
Shelly button is waterproof. But uses wifi
homeassistant
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io