Any of those look OK. The removal of the aircon panel just needs a lever (or two) that won't scratch the trim. Or a screwdriver and some tape over the trim. You need a small screwdriver to start releasing the the wedgelock.
The EHU just needs something long and flat each side to keep the spring clips from re-engaging.
You only need the special release keys if you want to remove the CD player on its own. Once you have removed the EHU with the CD player beneath, you can release the CD player without any special tool as the latches on the side are exposed.