You said it, /e/ devs should set up a Kõnele server(damn, it’s difficult to type that õ stuff), which called Kaldi gstreamer or PocketSphinx gstreamer.
I support this.
Meanwhile Mozilla is triyng to built his own voice recognition system. People can contribute by giving their voice or validating samples, here : https://voice.mozilla.org/
I’ve also been thinking about this recently, it would be very helpful to be able to dictate text. I had hoped that ASK would support this but it doesn’t seem to work:
Mozilla’s DeepSpeech is a bit heavy to run on-device I think, and in any case it’s just had its funding cut.
Voice control is becoming more and more popular and in some countries or demographics I have read that it is the most common input method (not necessarily most useful, but the most commonly used). This should be high on /e/'s list of things to support.