I agree with most of your points, but handrolling your own exporter really isn't all that bad¹. If you look through Exporter.pm, you'll find that most of it is just syntactic sugar around the following bit of code² that looks remarkably similiar to what you noted:

*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}
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There is also a nearly identical call for $vars and @arrays and %hashes, etc. Exporter.pm is mainly just a nicer interface for this admitedly scary chunk of code.

¹Assuming you're Lincoln Stein
²From 5.005_03 since I once disected its Exporter.pm for fun

-Blake