Welcome to the Roku Community and thanks for the inquiry related to alternatives to the existing Roku TV remote.
Have you tried connecting a mobile device to your Roku TV and use the Roku mobile app as a remote to control the TV volume?
For more information about using the Roku mobile app as a remote, visit our Support pages here:
Install the mobile app
Control your Roku without a remote
Let us know if that works out for you or if there is any other clarification we can provide with this option.
Roku Community Moderator