As we have absolutely no information on the Alexia remote device I have made the following assumptions.
Using the connection numbers in the pictures in post #8. The top three connections T1,T2,T,3 are a set of changeover contacts T1 is the NC contact and is connected internally on the Alexia to the supply negative.
T2 is the common of this set of contacts. T3 is the NO contact and is connected internally on the Alexia to the supply positive. When the button for this channel ( Call this button A.) is NOT pressed T2 is connected to the supply negative. When Button A is pressed T2 is connected to the supply positive.
The bottom three connections T4,T5,T,6 are a set of changeover contacts T4 is the NC contact and is connected internally on the Alexia to the supply negative.
T5 is the common of this set of contacts. T6 is the NO contact and is connected internally on the Alexia to the supply positive. When the button for this channel ( Call this button B.) is NOT pressed T5 is connected to the supply negative. When Button B is pressed T5 is connected to the supply positive.
Can you test if these assumptions are correct ?
Try this test. Move the actuator to about it's middle position using the buttons on the Alexia. Disconnect the actuator wire from T8 on the switch. Connect that wire to T3 on the Alexian note if the actuator moves and if it does which direction it moves,
Les.