Switchbot is likely your best bet.

I know some basic kettles and drip brew coffee machines are set to start as soon as they get power. So a basic smart plug works to initiate them. I’m not sure about an espresso machine.

I think the Aqara T2 relay could work here. https://www.aqara.com/us/dual-relay-module-t2/

Yeah, wiring in old homes can be super fucky. I grew up in an old home with knob and tube wiring.

Probably a Shelly relay. https://www.thesmarthomehookup.com/beginners-guide-to-shelly-relays-choose-the-right-relay-for-the-job/