USB DS device

You can't get the DS images out over OSC.

I don't think that ETC will support stream deck directly. But you can use a Raspberry Pi with network connection over OSC as a server.
For configuring you need an external laptop.

Yes…but! Companion lead me to that feature request, as it is possible for third party software to deliver the content of the buttons and displays. What if Eos would do that… send those shiny new fantastic icons to the hard buttons of streamdeck! I would love it! 

If I think about arrange that myself I’m a bit nervous about the amount of work to get it going.

Maybe streamdeck with companion is what you looking for.

Thanks for that hint… But I’m already struggling with labelling all the macro buttons on TI and @5 with tape and pen. It is the luxury of buttons with displays Wich is really attractive to me.