Shang Chi can also make a improvised weapon out of almost any ordinary object in his environment. He can wreck you with whatever he gets his hands on
I'm sure there will be some non Asians, because they're still going to want to connect it to the wider MCU, and the rest of the MCU are non Asian.
But what I'm saying is that Shang Chi doesn't need some kind of white or black side kick (like with Shanghi Noon or Rush Hour) who provides most of the acting/ comedy etc while Shang Chi only does the fighting. I don't want it to look like an Asian actor can't carry a movie on his own but needs back up from a Caucasian or black actor to make it more palatable to Western audiences.
I have no doubt an Shang Chi will certainly be the lead but every Marvel film has supporting characters and often there is some diversity in the supporting cast (Howling Commandos, Warriors Three, Scott Lang's buddies, Falcon, War Machine, Nick Fury, ect)
In terms of non-Asian cast members the most obvious ones to include from the comics would be
Shang Chi's adopted African brother N'Nai.
Allies Sons of The Tiger who are ethically diverse. The trio is made up of Chinese leader Lin Sun, African American Abe Brown who is also the brother of Spider-Man villain the prowler and caucasian Hollywood actor Bob Diamond who dated Colleen Wing in the comics.
Black Tar Jack who is white.
Nick Fury, Maria Hill, Lance Hunter, Tod Radcliffe or Everett K.Ross in place of Denis Nayland Smith who Marvel don't have the rights to anymore.