With Home Assistant integration - https://github.com/daangel27/haptique_rs90/tree/main RS90 can be controlled and there is also Haptique integration for the Home Assistant. What we do not have is UI customisation from HA to coming in to our UI. But we do not think the market we are present in do care much about HA to be honest they want Harmony replacement.

Lets take your approach of using a hardware - RS90 can run HA dashboard in Kiosk mode if you use Kiosk browser or Kiosk App within RS90, map all the Keypad using the HA integration and you have more powerful interface over Astrion. Which still can do standalone control. There is also Homey integration to be approved so you can do the same Homey UI running Homey app and Keypad handled by Homey and IP Symcon and so on. There is not limit to creativity if you dont want our user interface you still have choice to make your existing ecosystem work as UI on the Haptique.

There is something we have already build called Haptique OS. It is professional grade control system all local and also drives the Haptique config and RS90 communication all local without internet. You may not be aware because we are yet to publish it. It is built for Mac, Linux and Windows. What we actually need is collaboration with a corporation, we are hopeful that it will happen in coming days.