I don't have an HDR-2000T, but as it is similar to the HDR-FOX T2, I don't think you can access the second audio track of an mkv file. With native recordings (m2ts, with a ts file extension) that have sidecar files (hmt and nts) it is possible to access the audio description track; without the sidecars it is not. I have also converted a recording with English, German and Italian soundtracks to m2ts format and created the sidecar files using the sidecar package on the HDR-FOX: it is possible to select which soundtrack you want using the audio button on the remote control, but this does not work with other file types, or if the sidecar files are not present.
If you have access to ffmpeg it is easy to remux the mkv file and make the English stream the first audio stream, from the command line. If not, I think you can do the same with Handbrake on a Windows PC.