Installing European outlets in American kitchen for heat-based appliances
The main problem with European outlets and appliances is that they won't be listed to local standards, even if they are perfectly safe. We have our own set of 240V outlets and plugs, you'd just chop the cord and install the correct US standard plug - but that appliance itself would likely not carry US specific listings. That could cause you insurance problems.

The secondary problem is that there's no inherent "things go faster becasue the voltage is higher" - a 1000W kettle will boil water just as fast if it's designed to be supplied from 120V as if it's designed to be supplied from 240V - the only way it gets faster is to choose a higher wattage, on either voltage. 

Ditto the microwave oven. More power is more power, regardless of the supply voltage it's designed for.

You might find more joy investigating the expensive toys at a USA Restaurant supply for "commercial" appliances than importing things from Europe. Just beware of the ones that want 3-phase power.