Ideally, I'd like to be able to have the filter load the module directly. Then examine the Export variables if available for the module to know understand what would be exported by default and what tags would be allowed and such.

But not everything that exports uses Exporter, e.g. CGI.

Someone that concerned could just avoid default importing by always specifying a list of the actually desired imports. This would take care of the really expensive stuff like use POSIX;. Avoiding all importing is not likely to save much memory.

The phrase "Sufficiently Advanced Technology" made me think of "Enough Rope".