Sounds like a wonderful vacation!
Perfume shopping in Europe is great (just think Paris ...), so I would only bring a 5ml vial for the immediate needs, and then buy stuff in Europe. You could buy so many things, from the Serge Lutens exclusifs to whatever comes to mind, so it doesn't make sense to fill valuable luggage space and weight allowance for frags.
(Incidentally, it will certainly be cold in Europe, especially on the mountains, and compared to Thailand, but really, more than the cold per se, it's the humidity, it can be very rainy, so you should prepared with raincoats and the like).
cacio