For example flags for the batallions, you can use just 1 ISM, with 1 material and 1 texture, yet changing the values of the material change the shape of the flag and its icon.

This is because the ISM doesnt allow to change mesh, and it doesnt allow to change material for different instances. It only allows to change the transform.
My squads need rectangular flags and triangular flags, and other shapes.
I can have a map with the different flag shapes, and another map with its different symbols.
Then create a data table so to know the coordinates of each corresponding symbol and flag shape.

Edit:
Forgot to add that the Text Coord Node also needs the X and Y values to correspond to the X and Y proportion, in this case 0.05, 0.05.

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