That is really weird, dust shouldn't be able to get inside your psp, maybe it remains from when you opened it up, it happened to mine while I was trying to install a new faceplate (wich I couldn't get to fit).
As for the faceplate, on the ones you mention, the lens has to be removed from the inside, not as you plan on doing.
Maybe yours has a crack somewhere and the dust gets inside through there
Get an original one and see what happens, it's all I can think off
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