Night flights in europe largely depend on the country rules, i.e. NVFR is not allowed in Italy or Spain as far as I know. However, it's legal e.g. in Germany or Switzerland. In Switzerland, you don't even have to file a flight plan. For private flights, you can also take on passengers in a single engine. There are some other limitations, like circuit restrictions and airport opening hours.
So I'd say time building towards the 100 night hours is also feasible in europe, depending on where you are. But the 350 hours multi pilot time is impossible to accomplish without working for a company which does multi pilot operations, i.e. Offshore or VIP. EMS usually don't.