Here is an update on the matter.
Using the youtube downloader app here
[APP][4.0+] YouTube Downloader v4.3.2 | Android Development and Hacking | XDA Forums it is possible to send and open vp9 streams in bsplayer. Great.
There is a huge BUT though and it's that those streams contain video or audio only. So how do we get bsplayer to open two streams and play them simultaneously?
One big advantage to keep the streams separate is that it's possible to choose freely among the available streams and combine.
If anyone has any input on the issue it would be greatly appreciated.
Cheers /Mike