Hey,
I just came across this, and I genuinely believe that it must be added to the game. There is a trophy that involves non-league clubs from numerous countries, and it is UEFA-approved. There are teams from Belgium, Denmark, England and many others are participating.
I hope this gets added to the game!
See its website here: https://www.fenixtrophy.eu/about-us/
Here is the participants for this year: