I agree with SLC's answer:
As a British person I can say in this instance I just splash my hands, or move them in and out of the water stream very quickly.
Doing something like this also works with a ordinary flame, too, e.g. you can pass a finger quickly through the flame of a candle.
Do it quickly (and repeatedly if necessary): when your hand touches or passes through the water then it will instantly get wet, but not have time to absorb too much heat (note the difference between "temperature" and "heat", e.g. you can touch the outside of a metal kettle at 100C as long as you only do it very briefly).
It's annoying to have to do it (I'd rather have cold or warm water than hot -- having only too-host may be unsafe e.g. for children) but feasible.
This is assuming the temperature is only 60C or so (if it approaches boiling I fear even a drop would scald instantly). This graph ...
Hot Water Burn and Consumer Safety Chart
... suggests that at 65C it will scald ⚠ after 2 seconds -- however a fraction of a second might be safe.