My own order of the new Fire TV remote with app buttons has, unfortunately, been delayed so I haven't been able to test things out myself yet, but several of you have already told me that my Remapper app does work to remap the app buttons on the new remote.
How to Remap App Buttons on Fire TV Remotes
Alexa Voice Remote Pro, Fire TV Remote
Best (Free) FireStick Remote Apps in 2024 (How to Use them)
How to Remap App Buttons on Fire TV Remotes
Warning as Fire Stick block may force you to buy a new remote - Chronicle Live
Remap App Buttons on Fire TV Remotes - Moyens I/O
This crazy mod gives your Fire TV the look and functionality of Android TV
How to Remap App Buttons on Fire TV Remotes
How to Remap Any Android Smart TV Remote Buttons to Open Your Favorite Apps
Blocks Ability to Change Shorcut Buttons on Firestick Remote
Remap Firestick Remote Shortcut Buttons with Launcher Manager
blocks remapping of the Fire TV Remote's App Shortcut Buttons
Content providers on the remote's direct access buttons? : r/fireTV
s new Fire TV voice remote with app shortcuts will ship April 14th