They are upfront about the fact that it will only do one or the other this time, at least…

This post should be in the dictionary under Chesterton’s fence.

According to the WSJ, it is signed only “Donald” and the signature implies pubic hair. The OPs version matches that, yours does not.

So use whatever you were using before and add that as an external library to immich?

https://immich.app/docs/features/libraries

Sure, HA talks to its voice integrations using the Wyoming Protocol, see here for a list of available services: https://github.com/rhasspy/wyoming

You can, for example, follow the link to piper, run the docker container on your home server and then add a new “Wyoming Protocol” device in HA (you will be asked for IP/Port). You can then select your new STT service in the settings for Voice Assistant.