Hi,
I've got a lot of experience with using Perl (in past jobs in the field), and scraping websites. Perl makes it quite simple really to scrape sites and selectively replace data (i.e. update URLs, stripping out archive info, etc) and I'm positive I can write an effective application for you quickly.
A Perl script would run happily on your Mac.
This is my first time freelancing here, but I hope you consider my proposal as I'm positive I can prove my worth! Don't hesitate to get in touch if you have any queries about my proposal.
Thanks,
Rik.