Have you tried it? It does what you want. 
package main;
no strict 'refs';
*Foo::bar = sub { return __PACKAGE__ };
print Foo::bar(); # prints 'main'

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As for #2, __PACKAGE__ is changed by the parser into a string constant expression. It is not a language function that is evaluated, it's just a compiler directive. You can see this by checking the output of Deparse on the previous example: 
*Foo::bar = sub {
    return 'main';
}
;
print Foo::bar();

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blokhead

In reply to Re: __PACKAGE__ in anonysub by blokhead
in thread __PACKAGE__ in anonysub by thpfft

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