I know I'm not grasping all of your requirements here ... so maybe this will help you along your way. 

package Drone;
sub new { return bless {}, shift; }
1;

package Factory;
no strict 'refs';
sub fixup {
    #*Drone::bar = sub { return __PACKAGE__ };
    my $class = shift || __PACKAGE__;
    *Drone::bar = sub { return $class };
}
1;

package Subfactory;
use base qw( Factory );
1;

package main;
Subfactory->fixup;
my $foo = Drone->new;
print $foo->bar . "\n";

[download]
This prints out "Subfactory".

In reply to Re^3: __PACKAGE__ in anonysub by Tanktalus
in thread __PACKAGE__ in anonysub by thpfft

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