backpan.cpan.org was the piece of information I was missing. Many thanks to you (and gellyfish who also suggested it).

I use CPAN a *lot* but had never heard of it. It's not in the CPAN FAQ and doing a search for it in "all" returns nothing useful. Wonder why not ...

Anyway, my immediate problem is solved. PerlMonks triumphs over adversity yet again. Thanks!