Actually I just found out how to interpret the shorcut key code more or less :
What I previously wrote is wrong. It always should be 0x something and not 55xsomething (I don't know what overcame - I guess I wasn't paying attention).
0x0359 : the digits in bold give you the mode (ie CTRL+ or CTRL+ALT+ ...) and the other two give the key in itself.
Example:
hex('0x0659') corresponds to CTRL+ALT+Y. 06 represents CTRL+ALT and 59 represents Y...