relay coil voltage: can I have trigger with both 110v and 240v?
No.

"70%V or less of
nominal voltage"  means it won't be more than 70% but it also means it may be unreliable or slow or not activate at 50% Vac rating and 200% would exceed power rating of coil.

There are many alternatives, but appliances usually have a low Vdc for power relays.