I thing, that if you send the codes trough scripts via home assistant, you can use it with google assistant. If not you can always use IFTTT for this purposes, like I did initially, before I realise that my TVs are smart enough to integrate them in hassio trough media player component. 
But I’m still using these for my ACs and sound systems. But if you make some progress on your work, you can share it here.
I just read your project. I liked it a lot. Especially where you explain what and why are you doing. I think your links in the end can help me (especially the part with the AC IR reverse engineering)
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Yes, Ken Shirriff’s blog page has an amazing amount of information that can help us understand what is going on with all those IR pulses.
Cheers and thank you for posting here the project you found on YouTube.
Gustavo.
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This is great. Thanks for sharing. Was thinking on making something like this for my bedroom instead of getting another Harmony hub.