Sounds like a feature, not a flaw if you ask me. Taking a poke at the Distinguished Competition is a tradition (DC does the same thing and it's usually all in good fun), and it's not terribly hard to make the Squadron stand as its own thing while still being an obvious League proxy. Hell they just did it with the Eternals, which I figure is a bigger barrier to the Squadron being used; Marvel already did a League proxy with them so doing it again with evil versions isn't as appealing.
But I suspect if such a "evil variant" group does show up, it'll be evil Avengers, not evil Leaguers. But still, if there's a time to introduce the Squadron, it's now.