Im with the GOAT on this. This has good intentions but could lead to some bad outcomes like party members being kicked out of parties based on country they are from. Can you see mount effects in the party load screen? IF so that would make it worse as well.
We could modify this idea. Lets add and have flags for diablo 4 zones as the background and then your chosen hero in the foreground. So you could have Hawezar Barb red and black flag or Scoglen light green and dark green Druid flag. Then players can also choose the colors and you have tens of thousands of combos.