I would suggest you just work directly with two hashes. Then you have full direct access to either hash as required, as it appears your problem requires you to distinguish them anyway. 
$name{'555-1212'} = 'Jones';
$phone{'Jones'} = '555-1212';

[download]
I'm leery of modules which offer a bag of one-liner idioms, especially when it limits your control over the underlying native structures. Tie::File is cool as its implementation is non-trivial and subtle. Tie::Hash::TwoWay is not cool for the reason you found: it only works if you accept blanket assumptions.

--
[ e d @ h a l l e y . c c ]

In reply to Re: TwoWay hash modification by halley
in thread TwoWay hash modification by shemp

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.