Universal media player for Music Assistant - please help

Hi guys!
I have multizone amp (DAX88) that creates media_player for each zone in HA.
The problem is that these players lack PLAY_MEDIA command and are not available in Music Assistant.
Each of my 8 HA players have 4 inputs replicated from amp that can be selected, like on a picture below:

I have thought that it would be best to sacrifice one input just for use of Music Assistant and create 8 separate universal players just for MA by recreating them and adding PLAY_MEDIA command and fixing them to single input (AUDIO).
In this case I would need to create universal players with just one input (AUDIO) that are visible in MA.
I have managed to create this players with universal player - HA did create new media_players from universal media player integration and they are visible in MA, but they are not separated - e.g. - they still change inputs whenever I change input on “original” xantech integration input, and they remember last input chosen on the original player - and thus don’t work.
Could anyone help me with that issue please?
my configuration.yaml for one of the zones of universal player:

### Recreate DAX zones for MA - universal player for each zone and one input! ###
### Source: AUDIO ###
  - platform: universal
    name: Kitchen
    unique_id: audio_kitchen
#    children:
#      - media_player.chw_kitchen
    commands:
      turn_on:
        service: media_player.turn_on
        target:
          entity_id: 
          - media_player.chw_kitchen
        service: input_select.select option
#        target:
#          entity_id: 
#          - media_player.chw_kitchen
        data:
          option: AUDIO
        target:
          entity_id:
          - media_player.chw_kitchen       
      turn_off:
        service: media_player.turn_off
        target:
          entity_id:
          - media_player.chw_kitchen
      volume_up:
        service: media_player.volume_up
        target:
          entity_id: 
          - media_player.chw_kitchen
      volume_down:
        service: media_player.volume_down
        target:
          entity_id: 
          - media_player.chw_kitchen
      volume_mute:
        service: media_player.mute
        target:
          entity_id: 
          - media_player.chw_kitchen
      select_source:
        service: input_select.dax_source_kitchen
        target:
          entity_id: 
          - media_player.chw_kitchen
        data:
          entity_id: 
          - media_player.chw_kitchen
          option: AUDIO
      volume_set:
        service: media_player.volume_set
        target:
          entity_id: 
          - media_player.chw_kitchen
        data:
          volume_level: "{{ volume_level }}"
      play_media:
        service: media_player.play_media
        target:
          entity_id:
          - media_player.chw_kitchen

Or maybe it should be universal media player combining the INPUT media_player.audio and zone media_player.chw_kitchen ?
What is the best way to create a player for MA (it needs play_media: command which is missing in the original xantech integration for zones.
summarizing: my goal is to have a media player accessible in MA that is bind for good with one of DAX inputs.

The inputs are generated and selected somehow by input_select helper that is also created for every player:

alias: Generate Dax Sources
description: ""
triggers:
  - event: start
    trigger: homeassistant
conditions: []
actions:
  - data_template:
      entity_id:
        - input_select.dax_source_kitchen
        - input_select.dax_source_terrace
        - input_select.dax_source_guest_room
        - input_select.dax_source_master_bathroom
        - input_select.dax_source_zosia_s_bedroom
        - input_select.dax_source_zosia_s_bathroom
        - input_select.dax_source_master_bedroom
        - input_select.dax_source_zone8pre
      options: "{{ state_attr('media_player.chw','source_list') }}"
    action: input_select.set_options
mode: single


alias: changeDAXsources
description: ""
triggers:
  - entity_id:
      - input_select.dax_source_kitchen
      - input_select.dax_source_terrace
      - input_select.dax_source_master_bathroom
      - input_select.dax_source_zosia_s_bedroom
      - input_select.dax_source_zosia_s_bathroom
      - input_select.dax_source_zone8pre
      - input_select.dax_source_guest_room
      - input_select.dax_source_master_bedroom
    trigger: state
conditions: []
actions:
  - data:
      source: "{{ states(trigger.entity_id) }}"
      options: "{{ state_attr('media_player.chw','source_list') }}"
    target:
      entity_id: "{{'media_player.chw_' + trigger.entity_id.split('source_')[1]}}"
    action: input_select.set_options
mode: single

When I perform an action on input_select it does change the state of
input_select.zone helper but it doesn’t change actual zone.

action: input_select.select_option
data:
  option: AUDIO
target:
  entity_id: input_select.dax_source_guest_room

my goal is to create player that only has one input AUDIO available and switches on zone player and selects input AUDIO for it.
How to approach this?
I would be greatful if someone could show me the direction to go.