thanks to @MadK9 and thanks to @JoeViking245. I tried with the splash image and it works. It's really great and you were really kind to explain so well. Thank you very much.
I only have this request:
An option to go back to the launchbox or to choose between real wiimote and emulated wiimote, during the splashscreen, that is: if you have connected the wiimote press this button to start the game, if you do not have the wiimote press this other to start game with joypad, press this to return to launchbox without starting the game.
I have already created two scripts that can start the config files for dolphin with a WiimoteNew.ini file for the real wiimote and another WiimoteNew.ini file for the emulated wiimote.