500+500 CZK bounty: Requesting ceskatelevize.cz closed captions

Hi,
I have found how to manually download CCs from ceskatelevize.cz (Czech TV). Please add this feature to the ceskatelevize.cz plugin! It is trivial for shows/series, where the episode number is in the URL, but movies/one-offs don't seem to be that easy. For shows and series, the algorithm is trivial:

1. Check if the "Include closed captions/Stáhnout skryté titulky" tickbox in plugin settings is ticked (blank by default), else break.
2. Apply the regular expression replacement below. (This version works on the most common URL format)
   

     FIND: https\:\/\/www\.ceskatelevize\.cz\/porady\/[^\/]*\/(\d{3})(\d*)[\S]*

     REPLACE: https\:\/\/imgct\.ceskatelevize\.cz\/cache/data\/ivysilani\/subtitles\/$1/$1$2/sub.vtt

   (What the regex does in human language: get the second number in the URL (EpisodeID) and its first three digits (Epi) and apply them to this URL: https://imgct.ceskatelevize.cz/cache/data/ivysilani/subtitles/Epi/EpisodeID/sub.vtt, example: https://www.ceskatelevize.cz/porady/15496675472-prezidentske-volby/223411033110112/ => https://imgct.ceskatelevize.cz/cache/data/ivysilani/subtitles/223/223411033110112/sub.vtt) Note that not all URLs explicitly contain episode IDs, which may need to be retrieved by another function.
3. If the regex match was successful, add its result as the URL of a new item to downloads list and rename it to Episode name.vtt (same as the downloaded video sans file extension) so that VLC finds it.

I haven't written a line of Java code ever and I don't think I can add this functionality myself, the code seems quite daunting and plugin developer tutorials are no longer available. Therefore, I am offering a 500 CZK bounty via bank transfer or PayPal to whoever successfully adds this functionality for all CC'd content at ceskatelevize.cz. I will also donate the same amount to Vity's FreeRapid Downloader project once this is done. Tagging Vity, tong2shot and birchie as previous developers of this plugin to consider this first and foremost.