One suggestion would be a Logitech Harmony Remote:
Another suggestion a “Sunray” remote. Many TV Boxes come bundled with this type of remote, having some basic TV control learning capability by use of the TV remote, or an MX3 Air Mouse, which has similar learning capabilities with the advantage of a keyboard and more recently also voice control.
Tutorials on how to set these up via learning mode are available in the Library section of the Remotes Repository.
Hope this helps.