I had the same problem with the alloy stuck on.
I tried a slightly different approach as I didn’t have anything decent to hit the wheel from the other side of the car so ended up levering it off.
I will state that it is not the best method and comes with its own risks of damage.
Did have a ½” metal pipe lying around and used some wooden packing to prevent damage to the alloy, managed to get the pipe in and lever, with the lever jammed up against the brake disc (yikes!). Tried to make sure the lever was as close to the centre of the disc, the edge may have given way. Obviously this will depend upon alloy design. A few tries later at different places around the wheel and it came unstuck. Was about to give up as it wasn’t budging and didn’t want to go crazy with the amount of effort that was going into it.
Did also generously spray some WD40 between the wheel and hub and into the wheel bolt area.
An option when the car is lifted is to sit it down on some big blocks of wood, possibly cut from a railway sleeper, this may give a more stable platform.
As mentioned you could loosen the bolts a few turns and drive the car, not at crazy speeds though, giving it some sharp braking.