[inhumantsar]

There isn't really. Most manufacturers have multiple sets of patterns.

There are smart remotes with libraries of patterns and capable of switching between those, eg Logitech Harmony (assuming that's still a thing).

There are also "learning" remotes. One of these would be easiest to homebrew. Basically you've got an IR detector. You point your existing remote at it and tell it to start watching for whatever button you want to map. Then you press that button on your existing remote. Voila, key mapped. You just have to keep doing that for all the zillion and a half buttons on your remote and you've got yourself a clone.