asterisk users - Jan 2019 - Simple one-word offline free speech recognition in Asterisk (or as an AGI)?

When I last looked into this a couple of years ago, simple one-word speech
recognition was rather complex and slow.

At the moment, I use Google Speech Recognition which uses no local
processing power, and is very accurate and fast, allowing me to run on a
very low end VPS.

However, with the minimum of 15 seconds, numbers and words like "yes,
no"
soon eat up the 60 minute free allowance.

Have things changed much in the last couple of years? I see a couple of new
"standalone" projects even from the likes of Facebook and Mozilla, but
they
require a degree in C++ and, apparently, about 24 hours to build a voice
model on a high-end box with the latest graphics cards (for the number
crunching). Also, unless I'm reading it wrong, each second of speech takes
4 seconds to recognise on a low end machine with this standalone offerings
and similar ones.

https://github.com/facebookresearch/wav2letter
https://voice.mozilla.org/en

In fact, come to think of it, I really only need offline fast recognition
of numbers 1 to 20, yes, no, menu and help.
For voicemail transcription I'm happy to stick with Google's paid
service
as it's remarkably accurate with phone quality speech (beats Microsoft and
Amazon Transcribe hands down from what I can tell).

Oh, and UniMRPC seems rather complex and the licensing doesn't suit - 99%
of the time I have one channel (caller) but it can jump to 10 - I don't
want to have to buy a 10 channel license for that 1 hour a month!

Any ideas? Thanks
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