Hi, to be honest I haven't submitted anything for broadcast yet, but I plan to in the near future, so I'd probably have to deal with similar specifications. We can try and get your files to the right format. I use Lightworks I have the Pro license, so I can export the video file, if you have the archive file and media footage. The next bit is tricky. I could try using Davinci Resolve (Have you tried using this software ? It's free) and see if that works . Message me, maybe we can work outside of freelancer, and if you successful in getting the file through you can pay through the site.
Mikhail