the "rename" part needs clarification as not everyone knows that by heart.
to make a VST show up with another name, you have to open it with resedit and change the name of the aEff resource. you can do so by selecting it and then open the command-I for this resource.
if you play around with this, be aware that this is the name projects of host programs find their plugins back, so if you rename "prophet" to "bubu" your old projects will no longer work and you will no longer be compatible with other people.
for the same reason you should make sure to exactly type "Keyboards - Plugsound PS01" like noted above for the PS-free-hack.