Here’s the thing though, I know this is an ally flag, but it’s like they never considered symbols:
Ignore the really bad black and white background for a second.
Imagine the left side of the shape is an homage to the original pride flag and the right side is WHATEVER YOU WANT TO PUT IN IT. Uniform clean design with representation. Easy to draw for the layman (fill both sides in with rainbow if you want), and easy to add specific representation