Using Harmony for one-click subtitles

A similar question went unanswered, so not hopeful but here goes.

Using a Harmony remote and FLIRC on my PC, I was able to configure subtitles to turn on with a single button press. Is there any way to achieve this (using Harmony or anything else) on Plex on the Nvidia Shield Pro?

I plugged in a keyboard to the Shield, and the ‘L’ button (which cycles subtitles on PC) didn’t do anything. Is there any solution here?

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