Use external Roku device with streambar pro

I have a streambar pro which has already been returned for service once. It was a nightmare process, so when the replacement one had issues with the internet connection, we threw in the towel, bought a Roku Premiere and a cheap sound bar, and put the streambar in storage.

The thing is, we also have the Roku speakers and subwoofer. We're basically sitting on over $400 in audio equipment that we can't use. Is there any way to disable the internal Roku in the streambar, so that I can use it with my Roku Premiere?