okay wow - that was easier than expected 
Even the matterbridge typings were working after setting up a new repo from scratch.
Disclaimer
Please be aware that I invested just 2 hours into this project (setup + first entity integration) and barely tested anything. I have my Amazon Echo setup and connected to matterbridge and everything seems to work for me.
Currently supported
- Light entities (
light.) including on-off, brightness and hue & saturation control - Switch entities (
switch.) including on-off control - Media Players (
media_player.) are mapped to Switches and currently only support on-off control
Deployment
At the moment there is no “automated” way to deploy all this.
Local installation
As simple as installing matterbridge. See the README for details.
Docker
Luligu has created a docker-image and provides some details on how to run matterbridge in docker.
Use the existing matterbridge docker image and run the installation and configuration steps of my plugin in it.
I’ll create such a ready-to-use docker image in the next days.
Home Assistant Add-On
Of course there is no add-on existing, yet.
But I am planning to create the missing docker image and the corresponding add-on code in the next days or weeks.