Seriously. I'm a SWE and I would throw out a TV and get a new one before spending hours minimum figuring out how to switch the firmware to a open source version.
Because right now we have to actually perform some exploit to run custom firmware most of the time. What if there were just a toggle in the settings menu for which repo to look at?
Probably not, honestly. I get paid to do things like manage dependencies, and I'm not trying to do it at home. If this was one and done, just click a button and forget about it again, then maybe, but if I have to do things like think about what model number I have, and is it compatible with this version of the firmware, then no way.
