Command Button

The command button would function similarly to the command block because its function would be the same: executing commands, but with different method. The command button would be a mobile command block that could be executed without placing any blocks. The player would simply press the right mouse button or click the "Run" button if playing on a phone. Unlike the command block, the button wouldn't be able to be used with redstone. To enter a command, the player would have to crouch and press the mouse button or the "Run" button.

Repeating Command Button:

This would work with the same property as the block-based one, but it would work by having the player press the button, and the command would play continuously until the player pressed the button again to turn it off.

Chain Command Button:

This item would also transmit chain energy, but in this case, not arrows. Therefore, if a player presses the Impulse or Chain Command Button while facing another player holding the Chain Command Button, in addition to executing their command, the signal will also be transmitted, and the other player's command will also be triggered, even if they didn't press the button.

Using Command Buttons, players could quickly use their favorite commands. You could create a teleport, sound, time-freeze button, and more, and the button could be placed in your inventory. I'd really like to have such an item in the game, and I think others would find it useful too.