Here a proof of concept exporting AUTOLOAD and a package var $WITH.

Autoload tries then to call any missing sub via $WITH->sub

$WITH can be easily localized to scope the effects.

More sophisticated configurations like importing only dedicated methods or methods from different objects could be achieved by allowing $WITH to hold array or hashes or even be tied or blessed into a config object or all off the former.

use strict;
use warnings;
use Carp;


=head1 Method::Load

Exports an AUTOLOAD routine and a package var $WITH which holds an obj
+ect.

Any unknown calls 'name' will trigger $WITH->name();

A clean implementation should check if $WITH->can(name) is missing 
If an older AUTOLOAD already exists, delegate there 
otherwise report error from users package. 

=cut

package Method::Load;
use Data::Dump qw/pp dd/;

BEGIN { $INC{"Method/Load.pm"} = 1; } # hack: already required
use vars qw/$AUTOLOAD/;


sub import {
    my $import_pkg = (caller)[0];
    no strict 'refs';
    my $with;
    *{"${import_pkg}::WITH"} = \$with;
    *{"${import_pkg}::AUTOLOAD"}=\&autoload;
    
}

sub autoload {
    my ($pkg,$sub) = split /::/, $AUTOLOAD;
    #warn "AUTOLOAD: ", pp [$pkg,$sub ];

    my $obj;
    {
        no strict 'refs';
        $obj = ${"${pkg}::WITH"};
    }
    
    if (1) {
        $obj->$sub(@_);
    } else {                            # hide autoload from caller-ch
+ain
        my $c_ref = $obj->can($sub);
        unshift @_,$obj;
        goto &$c_ref;     
    }

}


=head1 Demo classes


=cut

package Delegate::Bar;
use Data::Dump qw/pp dd/;

sub bar {
    #warn pp [@_];
    my ($self,@args) = @_;
    Carp::cluck pp [$self->{args},@args];
}

sub new {
    my ($class,@args) =@_;
    return bless {args => \@args}, $class;
}

package Delegate::Foo;
use Data::Dump qw/pp dd/;

sub foo {
    #warn pp [@_];
    my ($self,@args) = @_;
    Carp::cluck pp [$self->{args},@args];
}

sub new {
    my ($class,@args) =@_;
    return bless {args => \@args}, $class;
}

    

=head1 Proof Of Concept

=cut


package Test;
use Method::Load;

my $obj= Delegate::Foo->new("is foo");

$obj->foo(0);

$WITH = $obj;                           # set globally

foo(1);


{
    local $WITH = Delegate::Bar->new("is bar");
    bar(2);
}

foo(3);
bar(4);                                  # fails
[download]

OUTPUT:

[["is foo"], 0] at d:/exp/t_Method_Load.pl line 77.
    Delegate::Foo::foo(Delegate::Foo=HASH(0x2dbc388), 0) called at d:/
+exp/t_Method_Load.pl line 100
[["is foo"], 1] at d:/exp/t_Method_Load.pl line 77.
    Delegate::Foo::foo(Delegate::Foo=HASH(0x2dbc388), 1) called at d:/
+exp/t_Method_Load.pl line 42
    Method::Load::autoload(1) called at d:/exp/t_Method_Load.pl line 1
+04
[["is bar"], 2] at d:/exp/t_Method_Load.pl line 63.
    Delegate::Bar::bar(Delegate::Bar=HASH(0x4574b10), 2) called at d:/
+exp/t_Method_Load.pl line 42
    Method::Load::autoload(2) called at d:/exp/t_Method_Load.pl line 1
+09
[["is foo"], 3] at d:/exp/t_Method_Load.pl line 77.
    Delegate::Foo::foo(Delegate::Foo=HASH(0x2dbc388), 3) called at d:/
+exp/t_Method_Load.pl line 42
    Method::Load::autoload(3) called at d:/exp/t_Method_Load.pl line 1
+12
Can't locate object method "bar" via package "Delegate::Foo" at d:/exp
+/t_Method_Load.pl line 42.
[download]

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