If you really cannot use a hash (and that's easily the best way to do this), install PadWalker and use my $lexicals = peek_my(0); to get a hash reference which you can use to manipulate all lexical variables bound to the current scope.

(If manipulating Perl 5 internals from pure Perl still seems less overkill than using a hash, consider that PadWalker can read from and write to and even create lexicals in other scopes, ignoring encapsulation.)