this is of course possible. Your game mode defines which character type will be spawned as player character.
You can override this game mode for your menu level by using the levels world settings tab. With another game mode for that level you can spawn another character handling what you want to do in your menu.
You will want to create a seperate Game Mode for your menu interface.
Just make a new one from the green Add New button. Select Blueprints then Game Mode.
The load up your menu level, open up world settings, select the Game Mode Override, then open up the dropdown and change your Default Pawn Class to whatever pawn you want to use for your situation.