I have a bunch of Tuya and Aqara buttons from AliExpress and I’m happy with them. I haven’t found anything similar on Canadian Amazon at least.
2,4,6 button variants of https://www.zigbee2mqtt.io/devices/WXCJKG11LM.html#aqara-wxcjkg11lm
4 button https://www.zigbee2mqtt.io/devices/TS004F.html#tuya-ts004f
I use HASS.agent to help manage my Windows desktop and expose various sensors to HA. It can suspend or hibernate the system. It does use MQTT as its connectivity plane.