The "use a different nozzle from another can" is the easiest and
cleanest method, as long as the paint tube isn't clogged. However, if
you really need to depressurize the can, I would think you'd want to
punch the hole as far from the pool of paint as possible. Stand the
can upright on your bench, and leave it for awhile (15 minutes?), so
that all of the paint settles to the bottom of the can. With the can
standing upright, punch the hole in the metal top (but not where the
nozzle tube comes through). The smaller the hole, the better. The air
escaping from the small hole should not take much paint, if any,
through the hole, because the air isn't pushing paint towards the hole
in the top. When the pressure is gone, you can then use some kind of
tool to open the can and pour the paint into a small bucket or similar.

Or, maybe I don't fully understand how spray paint cans work?