As long as the head gasket is still good, oil seals are good, and piston rings are good, everything around them can be replaced at home with a Haynes manual, except maybe the transmission and any welding work on the exhaust.
Just did a timing belt replacement in the driveway on mine, good for another ten years now.
If I did that half my neighbors would own my devices in a week because they like transmitting open access points for setup purposes. I just connect them anyway and then just block them from outbound access at the router if I want to restrict them. That way I can be sure. Then I can use my local Homeassistant server to control them from behind the firewall locally if they have that capability.