XMOS bridge between formats with ARC. Getting firmware into Amanero like HW.

A less exotic usecase for deterministic syncronized streams are different DAC at HF and MID/LF.
I see from detailed measurements of DACS that some has very low distortion below 1to 3k. And they are often cheap codecs. Then they could be used on MID/LF channels and reserve a more high end DAC for HF duty.
The dedicated MID/LF channels can also have a very simple 6dB oct analog LP output filter at lets say 3k. (Compensated in Xmos DSP if needed)
Maybe even oversampled PWM from XMOS chip can be used for LF/MID?
 
The official boards are a little expensive for me and my hobby project. Maybe this can do the job
https://wiki.seeedstudio.com/reSpeaker_usb_v3/
https://github.com/respeaker/ReSpeaker_Lite/blob/master/README.md
But don't know if xTAG can be used. And a litle sceptical on newbee (me) programing with firmware flash over USB.
I also dont know if ports can be dynamically allocated so that my custom program can reach the exposed pins (eg second TDM to XMOS_X0D33, XMOS_X0D35, XMOS_X0D36, XMOS_X0D42, XMOS_X0D43)