WOW! Never thought it could work! Leather swap. It is tricky, but I cracked the secret code.
Don't disassemble the vents, they are not meant to be!
The trick is: It all can be done from the front!
1.) Disconnect the connector carefully first.
2.) Pop the louvers carefully from the slanted side (facing towards the door) with a screwdriver, access them from above, pushing towards the middle. They will "pop" from their mounting holes.
3.) NO WORRIES...they all have a TINY number imprinted (except of the leather cover ones for obvious reasons) to keep the order for reassambly.
4.) Reassembly: pop all louvers (in order) into that connector FIRST.
5.) Carefully fiddle all pins into the mounting holes of the "INNER" side first.
6.) Carefully pop the other side one-by-one back in, on the other side (little force required, but not too much)