Use HandBrake to encode the video to 720p (or keep 1080p). Select the English track as Track 1, the dub as Track 2.
Find a legal secondary audio source – e.g., a DVD from a region with your desired dub. Use MakeMKV to rip just that audio track. gone girl 2014 2014 dual audio bdrip 720p hellywood mkv link
Use MKVToolNix (specifically mkvmerge ) to merge video, both audio tracks, and subtitles into a single MKV. Use HandBrake to encode the video to 720p (or keep 1080p)