"Pocas nueces, mucho ruido."
To reiterate, 'elegant' has been used by both artists with respect to aesthetics, and scientists with respect to scientific theories for many decades, if not longer. It is neither a cliché, nor a new, nor a novel use among the highly intelligent and highly educated, although it is clearly unfamiliar to you.
By any measure, 'Open Division' is an elegant solution to the decidedly inelegant circumstances created by either prohibiting transgender athletes from competition as the trend seems to be, or having the rights of elite cisgender female athletes trampled in capitulation to the tantrums of a minority of trans-activists.
The goal of 'Open Division' is inclusion. The objective is not to kick anyone out of anything, but rather to provide a classification where transgendered athletes can compete with dignity, and without any question of unfair advantage. If the goal is participation, Open Division accomplishes this elegantly, indeed VERY elegantly.
But your (mis)understanding of the situation seems to stubbornly evade the facts. The higher the level of competition, the more the need arises to equitably balance the 'wants' of all athletes, not just transgendered athletes.
The goal of whatever idea you are advocating seems to be to advantage transgender athletes unfairly (to the point of dominating the competition) against elite female athletes--an idea so patently unfair that transathletes will be excluded from competition altogether. If the goal is to guarantee wins for transathletes (as your intention appears to be) then they will lose more, much, much more in the long-run.
Your obsession with Hiltz seems to cloud your ability to understand that Hiltz ran as an elite female against other females, nothwithstanding Hiltz's own perceived gender identity. Hiltz is the veritable poster-child for equitable participation of a trans-identifying athlete.
More trans-identifying kids entering athletics? Great! All the more important to conceive a space where they can compete (not necessarily win) fairly, naturally, and with dignity. Allowing transgender female athletes to 'mop up' on the competition works against that.
Finally, as an aside, I don't know (for sure) with which community you yourself identify, but in mine the emerging pronoun preference is s/h/e/y (also 'shey') for non-binary individuals. Please educate your/themselves, and be respectful of s/h/e/ir preference(s).
As in, "None so ignorant as s/h/e/y who will not be educated."