Hello,
I have checked your pages and I believe that my team is able to re-design your page with fully-responsive. We also understand well about your URL friendly to keep, so we could finish a prototype design to let you revive on our testing environment before deploying on to your website resource.
We will try to let the website go post-launch after your validation in 7 days the max, honestly, your site could not be able to be done in shortest time unless I have to give you a bad result.
Thank you for attention and happy to discuss further.
Warmest Regards,
Terry.