Splitters work but be aware that they will undoubtedly tear the rubber boot which is not available as a spare.
Alternatively, jack the car up so the wheel is hanging. Place a large bar of steel (3/4" diameter x 12" long for example) against the top of the upright next to the ball joint and hit it with a BIG (lump type) hammer. A few blows will shock the joint loose and you will not have damaged the rubber boot.
Alternatively use the splitter and drive bootless !