Thanks for the help, Cathal_S.
MartyMc, I agree with Cathal_S. Although there are TV brands that can be set up for Chromecast with Google TV however, not pairable/compatible with the Voice Remote.
As a workaround, you may try to choose a different brand from the list which in your view has the same country of manufacture as the TV. You may also search for TV remote codes online and see if any other brand matches the same code as your TV, and select that other brand instead. However, please take note that this step may or may not work.
I hope this helps!