Is there a way to select my own selection of audio-busses to a SRT stream?

I want to stream 4 multichannel SRT streams, with 4 to 8 audio-channels.
It ís possible to stream 8 audio-channels to only one SRT stream, and only with Bus MABC.
But I want to stream 4 video inputs with 8 audio-channels to 4 Multichannel SRT streams.

Sending the video input directly to the output is easy, but audio kan only go over the vMix busses. I can not send the audio channels from the input directly to the SRT output. Please add this feature, or tell me how to configure this.

There is a maximum of 8 Stereo audio-busses. MABCDEFG, so there are 16 mono audio-channels. So sending 8 audio channels to 4 outputs is impossible.

So the second option is to send only 4 audio-channels to every SRT stream. But it is not possible to choose other audio-bus combinations, than the preset of vMix.
For example I would like combinations of MA, BC, DE and FG. But I can not choose by own selections of audio-busses.

Secondly, VLC player is not receiving multiple audio channels (jet). It can play multiple audio-channels from a file, but not from a srt stream.

Best scenario for me is to send the Input directly to the srt output.

Am I making any sense?