After playing with this for a while, it boils down to the fact that you can't get the pragma to bubble up an extra level but you can cut'n'paste (varying amounts of) code from the pragma's *.pm file into your own *.pm in order to create your own custom pragma which does the same thing (which seems obvious now but sure didn't a few minutes ago).

Anyway, the e.pm I wanted above can be had rather simply as:

package e;
require strict;
require warnings;
sub import {
    &strict::import;
    &warnings::import;
}
1;
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        - tye (but my friends call me "Tye")