"Unload more" in change filament menu (no replies)

Hi guys. When changing filament, there are two options: Purge more and Continue. I need a third option, "Unload filament", because in my printer sometimes the filament goes the wrong way (long story)... Is there a way to change menu_filament.cpp (or other) to include this option?

I just need a new menu option (together with "purge more" and "continue") to send "M702 U10" and them return to the menu (to purge more, unload more or continue print)

Thanks a lot!