Why have minimal packages at all? Would something like this work for you?

#
# This is the file My/Types.pm
#
package UNIVERSAL;

use strict;
use warnings;

sub create {  
    my $class = $_ [0];

    print "Creating class $class\n";

    eval <<"--";
    package $class;
 
    sub create {
        my \$class = shift;
 
        print "Now inside \${class}::create\n";
 
        bless [] => \$class;
    }
--
    no strict 'refs';
    my $sub = "${class}::create";
    goto &$sub;
 
}
 
1;

__END__


#!/usr/bin/perl

use strict;
use warnings;

use My::Types;

my $typeA1 = create TypeA;
my $typeA2 = create TypeA;
my $typeB1 = create TypeB;
__END__
Creating class TypeA
Now inside TypeA::create
Now inside TypeA::create
Creating class TypeB
Now inside TypeB::create
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Abigail

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