I don’t believe that SmartThings has documented these custom commands for the TVs anywhere. Unfortunately a quick search through the SmartThings Community didn’t find much either.
The other command that caught my eye in your list was postOcfCommand() - it sounds like the TV is following the OCF standard which Samsung was a big proponent of. Perhaps there’s an opportunity there?
Looking through the SmartThings community, there was a post or two about it. Here’s a snippet from one of them:
Maybe there’s an opportunity to use OCF commands… if you decide to research down that path and find anything useful, please be sure to update us here!
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Do you have a Harmony, Broadlink, or Global Cache IP2IR? I’ve heard other people have some success with those IR blaster/control devices.