Hi Job,
You won’t be able to control the speed of an AC fan with Fibaro Dimmer or any other dimmer. At least not proportional. The Fibaro dimmer is PWM (pulse width modulation), you could potentially kill the fan motor if you use such dimmer.
You can control the speed of an AC fan using a fan capacitor. A dual capacitor (3 wires) will give you three set speeds: low, medium and high. The controllers from your links above (Aliexpress and Vent-axia) give you the same three set speeds by using the very same principle, a dual capacitor.
So you need to buy one of this: https://www.banggood.com/CBB61-1_5uF2_5uF-3-WIRE-250VAC-Ceiling-Fan-Capacitor-3-Wires-p-1261375.html?cur_warehouse=CN
which works with your 230V AC fan.
Have an electrician install it for you!!!
I have an AC fan and a 3 wire capacitor. I use two Fibaro dual relay (FGS-222) to control the fan. Low, Medium, Fast and Stop.
The two dual relay gives 4 outputs. Three outputs I use for Low, Medium, High and the fourth is the control output which is wired nowhere, only using the switch input.
Then a series of flows switching in a sequence between the three speeds and stop with a bit of Better Logic help.
Let me know if you want to see those flows and a drawing of the circuit 
P.S. I have plenty of space behind the switch to fit the capacitor and the two dual relays as all walls are made of plaster. But maybe your house is all concrete walls with just a small box for every wall switch… then maybe fit the above devices somewhere in the ceiling fan.
