Dear alxlaxv,
I have a setup working for my Somfy shutters (with the same remote control) that's like described here:
RPi talks to an Arduino through USB
Arduino talks to CC1101 through a 5V to 3.3V level translator
CC1101 sends the commands to the shutter.
There is code available on the itnernet for the Arduino & CC1101 & Somfy RTS part, and I modified the code to be able to send instructions per USB (up/down/my with the number of the shutter in argument because I have 12 shutters in my house). On the RPi, I have a program that activates the shutters at a programmable moment (through a text based file) and that also hears for connections on a TCP socket, so that I can connect to it with an Android app (also written by myself).
If you want to go that way, I'm ready to send you some source code and instructions.
Best regards,
macload1