You can try copying the bindings from one account to another.
- Log on the account you have all your bindings already set on
- When you log in, it also downloads your keybinds and settings for that account
- Make a copy of the PersistedSettings.json file or just rename it
- this file is in the same folder as input.ini (default location C:\Riot Games\League of Legends\Config)
- Log on the account you want to copy the keybinds to
- Replace the PersistedSettings.json file with the copy you made in step 2
- Start a game
- Just do a custom game so you can see if it worked
If you can't log on to the first account, you can add the keybinds directly to the PersistedSettings.json file.
- Log on the account you want to set the bindings on
- Open PersistedSettings.json in notepad or some kind of text editor
- Press Ctrl+F (or use whatever search function is in your text editor) to search for "Input.ini"
- Add your keybinds while keeping the same formatting as the rest of the file.
- Start a game
If you want to just use the keybinds from input.ini directly.
- Log on the account you want to set the bindings on
- Delete the PersistedSettings.json file
- Add all your keybinds to input.ini (if you haven't already done so)
- Start a game