What I'm looking for is a Roku emulator and/or Brightscript interpreter app for Android TV. I want to effectively load up Roku as an app so I have access to channels that are only available on Roku. There is a Roku app for android, but it's a remote control for a roku, not a way to watch Roku channels on android.
I haven't found anything yet to suggest I'm not the first person to have thought of it. I have an NVidia Shield TV and I love it dearly, but adding Roku channels would add a lot of content.
99.99% of the thousands of Roku channels are garbage. What is it specifically you're looking for?