though this seems tempting, it is against all recommendations… always try to include your devices close to the final location. If only to have it create the mesh with the closest neighbors.
I just did one of these myself, well a double switch, and it was connected immediately, no healing of the network necessary. And this was with the core add-on and integration.
If the Kleine vijver is way out of reach for the stick to recognize it, you might be better of adding an extra device in between… As a last resort, you could maybe try to bring the Aeotec stick over to the Kleine Vijver, have it added locally, and re-attach the stick (might need a restart of the server)
As it happens the double switch I installed was for my Vijverpompen too 
But, I installed inside the house, in the box with the double switches. Why don’t you give that a try? Saves you all the hassle to make these waterproof outside, and brings it within reach of the stick most likely?