Argon ONE m.2 + LibreELEC + Harmony 300?

I have an m.2 running LibreELEC and would like to integrate my Logitech Harmony 300 remote with it. I’m having a great deal of trouble finding anything regarding setting such a thing up, however. I have the Argon remote but only the power button seems to work with the current set up (and despite what is mentioned, I have no remote configuration options in the Argon settings, just fan control), and ultimately, having it on my multifunction remote would really be the way I’d want to go anyway.

Does anyone have a clue on where I should start looking setting this up?