The solution is simple. If you are NOT going to check your pack, containing sharp objects and liquids, BUY a simple knife there. Postage, especially from outside the EU zone will be FAR more expensive than buying the knife there.
Just as a BTW and FYI, I must use powdered protein to supplement my diet each day. The protein comes in individual packets. I use a 2 1/2-inch child's scissor to open these packets easily, IT IS LEGAL TO TRAVEL BY AIR WITH A SHORT ROUNDED TIP SCISSOR.
In the US the maximum blade size permitted is 4 inches from the fulcrum of the scissor to the edge of the blade. The EU countries have a similar provision,. I believe the maximum length permitted is 6 cm, but do check.
My scissors were obtained form the stationery aisle of my local supermarket. I have passed through both US TSA as well as Portuguese and Spanish security checks, where I could see that they could see the scissors on the x-ray. They are not concerned.
So, if a scissor will do the trick, you can travel with one, as I mention here. If you really Do need a proper knife, buy one locally, on arrival.
I hope this helps.